In Memoriam 28.02.1949 - 20.02.2011

Privatdozentin Dr. Erica Melis (Tell) 
Principal Researcher
German Research Institute for Artificial Intelligence (DFKI)
Centre for e-Learning Technology
and associated at
Universität des Saarlandes
Computer Science Department

Nachrufe / Orbituaries

  • Dr. med. M. Breitenbach
  • Prof. Dr. Johannes A. Buchmann
  • Dr. rer. nat. C. Schroeder
  • Prof. Dr. H. Uszkoreit
  • Prof. Dr. Dr. hc (mult) Wahlster
"She died in peace in my arms supported by phowa within our buddhist tradition, in February 2011." Jörg Siekmann


Special Issue: International Journal of Artificial Intelligence in Education (IJAIED); Emerging Technologies and Landmark Systems for Learning Mathematics and Science: Dedicated to the Memory of Erica Melis (2014), 24(3,4);
International Journal 1International Journal 2

Research Interests

Intelligent Learning Environments and Tools

Web-based education environment Active Math and MathBridge for Mathematics. This includes AI-techniques such as user-adaptivity, course generation, student modeling, cognitive tools, exercise generation, feedback generation, diagnosis, tutorial strategies, integration of service systems, etc.

Proof Planning

... knowledge-based proof planning, constraint solving for proof planning, meta-reasoning, productive use of failure. My favoured case study on epsilon-delta-proofs...
Mixed-initiative proof planning for education, including user-interface for proof planning, feedback generation, communication with learning system, scenarios, etc.

Case-Based Reasoning, Analogy

Automated Deduction

Leading the ActiveMath Group and Math Bridge

... at University of Saarland and German Research Center for Artificial Intelligence.


Current Projects for Technology-Enhanced Learning

- coordinating EU-project Math-Bridge (eConentPlus project) 2009-2012
- DFG-project ALoE (Online Learning with Erroneous Examples), principle investigator
- DFG-project ATuF (Adaptive Tutoring Feedback), principle investigator
- Mathe-Brücke (mit HTW),principle investigator
- AMor (maths for physicists and chemicists), principle investigator
- ActiveMath-EU quasi-coordinator

Previous projects include

- EU-project LeActiveMath Language-enhanced, user-adaptive, interactive eLearning in Mathematics which I coordinated
- EU-project iClass
- EU-project Mowgli
- DFG project MIPPA, principle investigator
- SFB 378SFB 314

Recent Organizational Activities

serving in program committee of recent conferences, among others

- Artificial Intelligence in Education
- SWEL workshops
- International and European Conference on Case-Based Reasoning
- International Conference Cognition and Exploratory Learning in the Digital Age
- World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education
- IADIS International Conference on WWW/Internet
- European Conference on Technology-Enhanced Leanring, ECTEL
- International Conference on Artificial Intelligence and Symbolic Computation

Short CV

Studied mathematics at Humboldt-University, Berlin. 
PhD in logic and methodology of science, Humboldt-University, Berlin. 
Habilitation in Computer Science, Saarbrücken
DFG-research fellow at University of Saarbrücken, Department of Computer Science 
1993-94 research fellow at Carnegie Mellon University, School of Computer Science, Pittsburgh, USA 
1994-95 European research fellow at University of Edinburgh, Department of AI, UK 
1996-2000 senior researcher at the University of Saarbrücken, Department of Computer Science
2000- principle researcher and project leader at the German Reseach Institute on Artificial Intelligence (DFKI) 
Erica pioneered knowledge-based proof planning (see some major publications) and is now prominently involved in Technology-Enhanced Learning/ Intelligent Tutoring Systems with research and developments for the web-based, adaptive and semantics-based ActiveMath platform as well as interdisciplinary research on various instructional interventions.

Courses and other Education

- Master theses and doctoral theses / in Arbeit befindliche und zu vergebende Bachelor- und Master- und Diplomarbeiten
- WS 2010-2011 Seminar Computer-Based Educational Technologies
- WS 2009-2010 Seminar Intelligent Tutoring Systems
- SS 2009 Seminar Intelligent Tutoring Systems, no more participation
- WS 2008/2009 Educational Technologies for Informatik-, Erziehungswissenschaft-, Psychologie-Studenten
- WS 2007/2008 Educational Data Mining
- WS 2006/2007 Intelligent Educational Technologies
- SS 2006: Seminar Intelligent Tutoring Systems
- WS 2005/2006: Seminar Hands-on Mathematics for Computer Scientists
- SS 2004/2005 EducationalTechnologies
- WS 2004/2005 Seminar: Hands-on Mathematik für Informatiker
- WS 2004/2005 Interaktive Übungen zur Vorlesung Mathematik für Informatiker
- WS 2003/2004 Seminar: Hands-on Mathematics for Computer Scientists
- SS 2003 educational technologies
- SS 2003 AI-Planning/ automatische Planverfahren
- SS 2002 e-learning
- SS 2001
- WS 2001 Proseminar Benutzermodellierung und -adaptivität
- SS 2000 Course on AI-planning and proof planning
- WS 1999 seminar on AI-planning
- SS 1998 Machine Learning
- SS 1997 Introduction to Artificial Intelligence
- SS 1996 Analogy and Case-Based Reasoning

Selected Publications


- Erroneous Examples: Effects on Learning Fractions in a Web-Based Setting. International Journal of Technology Enhanced Learning (IJTEL), submitted. 2010. preliminary pdf with D. Tsovaltzi, B.M. McLaren and A-K. Meyer.
- Gap Detection in Web-based Adaptive Educational Systems. International Conference for Web-Based Learning, ICWL 2010. With D. Jednoralski, S. Sosnovsky and C. Ullrich.
- Supporting Flexible Competency Frameworks. International Conference for Web-Based Learning, ICWL 2010. With C. Ullrich, S. Doost and A. Faulhaber.
- How to Support Meta-Cognitive Skills for Finding and Correcting Errors? Cognitive and Metacognitive Educational Systems, AAAI Fall symposium, Arlington, AAAI Press, 2010. With A. Sander and D. Tsovaltzi.
- Learning from Erroneous Examples: When and How do Students Benefit from them? Second-Best paper at EC-TEL 2010, pages: 357-373, M. Wolpers, P.A. Kirschner, M. Scheffel, S. Lindstaedt and V. Dimitrova (eds), LNCS 6383, Springer-Verlag, 2010. With D. Tsovaltzi, B. McLaren, K. Meyer, M. Dietrich and G. Goguadze.
- Complex Course Generation Adapted to Pedagogical Scenarios and its Evaluation. Journal of Educational Technology and Society, vol. 13(2), 2010. With C. Ullrich.
- Learning from Erroneous Examples. Internatioal Conference on Intelligent Tutoring Systems. Vincent Aleven, Judy Kay and Jack Mostow (eds), Springer-Verlag, Lecture Notes in Computer Science, 6095, 2010, pages: 420-422, With D. Tsovaltzi, B. McLaren, M. Dietrich, G. Goguadze and A-K. Meyer.


- Complex Course Generation Adapted to Pedagogical Scenarios and its Evaluation. Educational Technology and Society, 2009. preliminary pdf with C. Ullrich.
- Erroneous Examples: A Preliminary Investigation into Learning Benefits. European Conference for Technology-nhanced Learning, EC-TEL 2009. preliminary pdf with D. Tsovaltzi, B. McLaren and M. Dietrich and G. Goguadze and A-K. Meyer
- A New Framework for Dynamic Adaptations and Actions. European Conference for Technology-nhanced Learning, EC-TEL 2009. preliminary pdf with C. Ullrich and T. Lu
- Culturally Aware Mathematics Education Technology. In: The Handbook of Research in Culturally-Aware Information Technology: Perspectives and Models. Emmanuel Blanchard and Danièle Allard (eds) preliminary pdf with G. Goguadze and P. Libbrecht and C. Ullrich.
- ActiveMath - a Learning Platform With Semantic Web Features. In: Ontologies and Semantic Web for e-Learning. D. Dicheva and J. Greer (eds), 2009, preliminary pdf with G. Goguadze and P. Libbrecht and C. Ullrich.
- Effects of Erroneous Examples, Results of a Preliminary School Experiment. AI in Education 2009, pdf , with Dieter Kriesell.
- Just-In-Time Adaptivity Through Dynamic Items. User Modeling and Adaptation and Personalization (UMAP) 2009, pdf with Carsten Ullrich and Tianxiang Lu.
- Combining Evaluative and Generative Diagnosis in ActiveMath. AI in Education 2009, with Georgi Goguadze, pdf
- Culturally Adapted Mathematics Education with ActiveMath. Artificial Intelligence and Society, Special Issue on Enculturating HCI. with G. Goguadze, P. Libbrecht, and C. Ullrich. pdf


- Pedagogically Founded Courseware Generation based on HTN-Planning. International Journal for Expert Systems with Applications, 2008. with Carsten Ullrich, preliminary pdf
- Interoperable Competencies Characterizing Learning Objects. Proceedings of the International Conference on Intelligent Tutoring Systems, ITS-2008, pages: 416-425, with A. Faulhaber, A. Eichelmann, S.Narciss, pdf
- An Efficient Student Model Based on Student Performance and Metadata, 18th European Conference on Artificial Intelligence (ECAI-2008), pages: 276-280, with A. Faulhaber,, preliminary
- One Exercise - Various Tutorial Strategies. Proceedings of the International Conference on Intelligent Tutoring Systems, ITS-2008, pages: 755-757, with G. Goguadse, pdf
- Feedback in ActiveMath Exercise. In: Proceedings of International Conference on Mathematics Education (ICME), with G. Goguadse, 
- Analyzing Computer-Based Fraction Tasks on the Basis of a Two-Dimensional View of Mathematics Competences. In: Beyond knowledge: the legacy of competence, J. Zumbach, N. Schwartz, T. Seyfert and L. Kester (eds), pages: 125-134, with A. Eichelmann, S. Narciss and A. Faulhaber, preliminary doc
- Towards Accessing Disparate Educational Data in a Single, Unified Manner. European Conference on Technology-Enhanced Learning, EC-TEL 2008, pages: 280-283, with B.McLaren and S.Solomon,pdf


- Proof Planning with Multiple Strategies. Aritificial Intelligence, vol.172, pages; 656-684, , with A.Meier and J. Siekmann
- Authoring, Specification and Prototyping of Personalized Workplace Learning Solutions. International Journal of Learning Technology, Special Issue on Authoring of Adaptive and Adaptable Hypermedia. with Peter Dolog and others.
- How ActiveMath Supports Moderate Constructivist Mathematics Teaching. International conference on Technology in Mathematics Teaching (ICTMT) 2007, with M. Moormann, C. Ullrich, G. Goguadze and P. Libbrecht pdf.
- Results from Action Analysis in Interactive Learning. Journal of Interactive Learning Research (JILR), 18(2):185-205, AACE, 2007. with O. Scheuer and M. Muehlenbrock preprint.
- Challenges in Search and Usage of Multi-Media Learning Objects. Proceedings of the Chinese-German Workshop on Cognitive Systems, pages: 36-44, LNAI 4429, Springer-Verlag. E. Melis, R. Shen, J. Siekmann, C. Ullrich, F. Yang and P. Han


- Reductio ad Absurdum: Planning Proofs by Contradiction. Essays in Honor of Gigina Aiello, O. Stock (ed), Springer-Verlag, LNAI 4155, 2006. with M. Pollet and J. Siekmann. preprint
- LeActiveMath, First European Conference on Technology Enhanced Learning 2006, with J. Haywood and T. Smith preprint
- Querying Heterogeneous and Distributed Learning Object Repositories via Ontology-Based Mediation. First European Conference on Technology Enhanced Learning 2006, with P. Kärger and C. Ullrich.
- Combining ITS and eLearning Technologies: Opportunities and Challenges. Intelligent Tutoring Systems (ITS-06), pages: 278-287, with C. Brooks and J. Greer, LNCS 4053, 2006. preprint
- Challenges in Search and Usage of Multi-Media Learning Objects. Journal of Computer Science and Technology with R. Shen, J. Siekmann, C. Ullrich, F. Yang, P. Han
- Semantic-Aware Components and Services in ActiveMath, British Journal of Educational Technology. Special Issue: Semantic Web for E-learning, Special Issue, 37(3): 405-423, 2006.
- ActiveMath! In: OMDoc: An Open Markup Format for Mathematical Documents (M. Kohlhase), LNAI, Springer-Verlag
- Semantic Search in LeActiveMath. WebALT Conference 2006, pdf with P.Libbrecht
- Impasse-Driven Reasoning in Proof Planning. Proceedings of the Fourth International Conference on Mathematical Knowledge Management, LNAI 3863, pages:143-158, 2006. at SpringerLink preliminary pdf with A. Meier
- Authoring Presentation for OpenMath Proceedings of the Fourth International Conference on Mathematical Knowledge Management (MKM2005), LNAI 3863, pages:33-48, 2006. at SpringerLink preliminary pdf


- Interactivity of Exercises in ActiveMath. International Conference of Computer in Education and Learning (ICCEL-05), pdf with Goguadse and Gonzales-Palomo
- Implementing Courseware to Support Learning Through Real-World Erroneous Examples: Student's Perceptions of Tertiary Courseware and Obstacles to Implementing Effective Delivery Through VLE. Proceedings of European Conference on eLearning (ECEL-2005), doc file with R.Monthienvichienchai
- ePortfolios in ActiveMath. ePortfolio 2005, 213-222, Cambridge, 2005. pdf with M. Homik
- e-Learning Logic and Mathematics: What we Have and What we Still Need. In: Essays in Honor of Dov Gabbay. pdf with J. Siekmann
- Failure Reasoning in Multiple-Strategy Proof Planning. Electronic Notes in Theoretical Computer Science, vol 125 M.P. Bonacina and T. Boy de la Tour (eds), pages 67-90, 2005. pdf with A. Meier
- MULTI: A Multi-Strategy Proof Planner. 20th International Conference on Automated Deduction (CADE-20), 250-254, 2005. pdf with A. Meier.
- Interactive Concept Mapping in ActiveMath, 3. Deutsche e-Learning Fachtagung der Gesellschaft fuer Informatik, DeLFI pdf with P.Kaerger and M. Homik
- Design of Erroneous Examples for ActiveMath. International Conference on AI in Education. IOS Press, 2005. pdf
- Global Feedback in ActiveMath. In: International Journal of Computers in Mathematics and Science Teaching, AACE, 2005 with E.Andres pre version
- Why Proof Planning for Maths Education and How? In: Festschrift in Honor of Jörg Siekmann, D. Hutter and W.Stephan (eds), LNCS 2605, pages 364-376 2005. pdf


- Erroneous Examples as a Source of Learning in Mathematics. International Conference: Cognition and Exploratory Learning in the Digital Age (CELDA), Kinshuk, D.G. Sampson, P. Isaias (eds), pages 311-318, 2004. doc
- Constraint Solving for Proof Planning. In: Journal of Automated Reasoning,33(1): 51-88, 2004. with J.Zimmer pdf
- Adaptable Mixed-Initiative Proof Planning for Educational Interaction. Electronic Notes in Theoretical Computer Science, 2004 with A.Meier and M. Pollet pdf
- Towards Adaptive Generation of Faded Examples. International Conference on Intelligent Tutoring Systems, ITS-2004, J.C. Lester and R.M. Vicari and F. Paraguacu (eds), pages 762-771, with G. Goguadze pdf
- ActiveMath: An Intelligent Tutoring System for Mathematics. Seventh International Conference 'Artificial Intelligence and Soft Computing (ICAISC). L. Rutkowski and J. Siekmann and R. Tadeusiewicz and L.A. Zadeh (eds), Springer-Verlag, pages 91-101, 2004. with J. Siekmann pdf
- Gender-Biased Adaptations in Educational Adaptive Hypermedia. Proceedings of the Third International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems. pages {425-428, Springer-Verlag, 2004. with C. Ullrich pdf
- Adaptive Access to a Proof Planner. Third International Conference on Mathematical Knowledge Management (MKM-2004), A. Asperti and G. Bancerek and A. Trybule (eds), pages 251-264, Springer-Verlag, 2004. with A.Meier and M. Pollet pdf
- They Call It Learning Style But It's so Much More. World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education (eLearn-2004), pages 1383-1390, 20004. with R. Monthienvichienchai pdf


- Education-Relevant Features in ActInMath. In: Online Educa, 9th International Conference on Technology Supported Learning and Training, 2003.
- The Poor Man's Eyetracker DFKeye. In: International Conference on Human Computer Interaction, 2003 with C.Ullrich and D.Wallach. doc
- User Interface for Adaptive Suggestions for Interactive Proof. In: User Interfaces for Theorem Provers, 2003. with M.Pollet and A.Meier
- Local and Global Feedback In: International Conference on AI in Education, 2003. E. Melis. pdf
- Polya-Scenarios in ActiveMath. In: International Conference on AI in Education, 2003, with C. Ullrich. pdf
- Global Feedback in ActiveMath. In: Proceedings of the World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education with E. Andres. (eLearn-2003), 2003. pdf
- Lessons for (Pedagogic) Usability Design of eLearning Systems. In: Proceedings of the World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education (eLearn-2003), 2003. with M. Weber. pdf
- Problems and Solutions for Markup for Mathematical Examples and Exercises. In: International Conference on Mathematical Knowledge Management, MKM03, 2003. with G. Goguadse, C. Ullrich and P. Cairns pdf


- About the Global Suggestion Mechanisms in ActiveMath. ITS-02 Workshop on Creating Diagnostic Assessments, 2002, with E. Andres
- The Poor Man's Eyetracker in ActiveMath. InternationalWorld Conference on E-Learning in Corporate, Gevernment, Healthcare, and Higher Education 2002. with C. Ullrich
- Call for a Common Web-Repository of Interactive Exercises. Workshop on Internet-Accessible Mathenatical Computation 2002.
- Using Computer Algebra Systems as Cognitive Tools. 6th International Conference on Intelligent Tutor Systems, 2002, with the ActiveMath Group
- Knowledge Representation and Management in ActiveMath. Journal of Artificial Intelligence and Mathematics. 2002, with the ActiveMath Group
- Proof Development with OMEGA. 19th Conference on Automated Deduction, 2002, with the Omega Group


- ActiveMath: A Generic and Adaptive Web-Based Learning Environment. Journal of Artificial Intelligence and Education 12(4), pages 385-407, 2001. pdf
- Randomization and Restarts in Proof Planning. European Conference on AI-Planning 2001, pages 403-408 with A. Meier and C. Gomes pdf
- Automated Proof Planning for Instructional Design . Annual Conference of the Cognitive Science Society 2001, with Ch. Glasmacher, C. Ullrich, and P. Gerjets.
- ActiveMath: System Description . International Conference on AI and Education (AIED-2001)
- Generating Personalized Educational Documents Using a Presentation Planner, ED-Media 2001, with P.Libbrecht and C. Ullrich.


- Dialog Issues for a Tutor System Incorporating Expert Problem Solvers. AAAI Fall Symposium on Building Dialog Systems for Tutorial Applications, E. Melis and H. Horacek
- The `Interactive Textbook' Project. E. Melis. CADE workshop on deduction and education.
- Extensions of Constraint Solving for Proof Planning. E. Melis and J. Zimmer and T. Mueller. ECAI-2000.Proof Planning with Multiple Strategies. E. Melis and A. Meier. CL-2000.
- Adaptive Course Generation and Presentation. ITS workshop on Adaptive and Intelligent Web-Based Education Systems.
- Domain Knowledge for Search Heuristics in Proof Planning. E. Melis and M. Pollet. AIPS workshop on Analyzing and Exploiting Domain Knowledge.
- On the Benefit of Expert Services in Mathematics Education Systems. E. Melis and A. Fiedler. ITS workshop on Modeling Human Teaching Tactics and Strategies.
- Concepts in Proof Planning. E.Melis and J.H. Siekmann, 
In: Intellectics and Computational Logic., pages: 263-276, Kluwer, 2000. pdf


- Knowledge-Based Proof Planning. E. Melis and J.H. Siekmann, Artificial Intelligence Journal, 115(1): 65-105, 1999. preliminary version
- Employing External Reasoners in Proof Planning, E. Melis and V. Sorge, Calculemus'99 workshop, pages 123-134.
- Omega - A Mathematical Assistant System. J.H. Siekmann, M. Kohlhase, and E. Melis 
In: Essays Dedicated to Johan van Benthem on the Occasion of his 50th Birthday , Amsterdam University Press, published on CDROM.
- A Proof Presentation Suitable for Teaching Proofs. E. Melis and U. Leron, 9th International Conference on Artificial Intelligence in Education, pages 483-490, 1999.
- Flexibly Interleaving Processes. E. Melis and C. Ullrich, International Conference on Case-Based Reasoning, pages 263-275, 1999.
- Analogy in Inductive Theorem Proving. preliminary version E. Melis and J. Whittle, Journal of Automated Reasoning 22(2): 117-147, 1999.


- Proof Presentation Based on Proof Plans, E. Melis, technical report.
- Omega: Ein mathematisches Assistenzsystem. J.Siekmann, M. Kohlhase, E. Melis. In: Kognitionswissenschaft, 1998, (in German).
- Constraint Solving in Logic Programming and in Automated Deduction: a Comparison. A. Armando, E. Melis, and S. Ranise. International Conference on Artificial Intelligence: Methodology, Systems, and Applications (AIMSA-98)
- Reformulation in Case-Based Reasoning. E. Melis, J. Lieber, and A. Napoli. European Conference on Case-Based Reasoning 1998.
- Similarities and Reuse of Proofs in Formal Software Verification. E. Melis and A. Schairer. European Conference on Case-Based Reasoning 1998.
- AI-Techniques in Proof Planning. E. Melis, European Conference on Artificial Intelligence (ECAI-98).
- An Argument for Derivational Analogy. E. Melis and J.G. Carbonell, Advances in Analogy Research, 1998.
- Case-Based Reasoning Applied to Planning. R. Bergmann, H. Munoz-Avila, M.M. Veloso, and E. Melis, 
In: Case-Based Reasoning Technology from Foundations to Applications. M. Lenz, B. Bartsch-Spörl, H-D. Burkhard, and S. Wess (eds.), Springer.
- The "Limit" Domain E. Melis, Artificial Intelligence Planning Systems (AIPS'98).
- The Heine-Borel Challenge Problem: In Honor of Woody Bledsoe. E. Melis, Journal of Automated Reasoning 20(3).


- Progress in Proof Planning: Planning Limit Theorems Automatically. E. Melis, technical report, October 1997.
- External Analogy in Inductive Theorem Proving. E. Melis and J. Whittle, German Annual Conference on Artificial Intelligence, 1997
Solution-Relevant Abstractions Constrain Retrieval and Adaptation. E. Melis, In: Case-Based Reasoning Research and Development, D. Leake and E. Plaza, 1997.
Beweisen durch Analogie. E. Melis, Kognitionswissenschaft (journal), in German, 1997.
Analogy as a Control Strategy in Theorem Proving. E. Melis, J. Whittle, FLAIRS conference, 1997


- Island Planning and Refinement, E. Melis Technical report, SR-96-10, 1996.
- Internal Analogy in Theorem Proving, E. Melis, J. Whittle, Conference on Automated Deduction (CADE-96).
- Two Kinds of Non-monotonic Analogical Inference, M. Kerber, E. Melis, In: Practical Reasoning, LNAI 1085, 361-374.
- When to Prove Theorems by Analogy? E. Melis. German Annual Conference on Artificial Intelligence, 1996.
- Planning and Proof Planning. E. Melis and A. Bundy, ECAI-96 Workshop on Cross-Fertilization in Planning, 1996.


- Analogy in Clam. E. Melis, DAI Research Paper 766, Edinburgh 1995.
- A Model of Analogy-Driven Proof-Plan Construction, E. Melis, International Joint Conference on Artificial Intelligence (IJCAI-95).
- Theorem Proving by Analogy - A Compelling Example E. Melis, Progress in Artificial Intelligence.
- Using Exemplary Knowledge for Justified Analogical Reasoning, M. Kerber and E. Melis, WOCFAI-95.


- Analogy Makes Proofs Feasible. E. Melis and M. Veloso, CBR-workshop AAAI-94.
- Decomposition Techniques and their Applications. E. Melis, International Conference on Artificial Intelligence: Methodology, Systems, and Applications (AIMSA-94).
- How Mathematicians Prove Theorems, E. Melis, Sixteens Annual Conference of the Cognitive Science Society 1994.
- Representing and Transferring Diagonal Methods. Technical Report CMU-CS-94-174.

1993 and before

- System and Processing View in Similarity Assessment. S. Wess, D. Janetzko, and E. Melis, Proceedings of the First European Workshop on CBR, 1993.
- Analogous Proofs - A Case Study, E. Melis, SEKI-Report SR-93-13.
- Goal-Driven Similarity Assessment. D. Janetzko, S. Wess, and E. Melis. Proceedings of the 16th German AI-Conference (GWAI-92), LNAI 671.
- Grundlagen von Analogiebildung - Zu Perspektiven ihrer Rechnerstuetzung. Communication and Cognition 22/1989.
- Das Geheimnis der Wendeltreppe. E. Melis and Ch. Melis Wissenschaft und Fortschritt 39/1989.
- Some Considerations about Formalization of Analogical Reasoning. E. Melis and Ch. Melis, In: Analogical and Inductive Inference, LNAI 265, 1987.