- Revue d'Intelligence Artificielle 25(2):281-308 (2011)
- CARDIS, volume 1820 of Lecture Notes in Computer Science, page 71-84. Springer, (1998)
- Technique et Science Informatiques 29(8-9):865-870 (2010)
- EC-TEL, volume 6383 of Lecture Notes in Computer Science, page 109-122. Springer, (2010)
- T. Edutainment (2010)
- Operating Systems Review 43(1):36-43 (2009)
- Research and Practice in Technology Enhanced Learning 1(1):3-29 (2006)
- Journal of Graph Theory 55(4):291-305 (2007)
- International Handbook of Mathematics Education, Kluwer academic publishers, Dordrect, NL, (1996)
- TrustBus, volume 4657 of Lecture Notes in Computer Science, page 94-103. Springer, (2007)
- (1996)
- Kluwer Academic Publishers, (1997)
- (2006)
- (1996)
- NSPW, page 79-86. ACM, (2001)
- Mathematical knowledge : Its growth through teaching, Kluwer Academic Publisher, (1991)
- Preuve: International Newsletter on the Teaching and Learning of Mathematical Proof (1999)
- Mathematics, Teachers and Children, Hodder and Stoughton, London, (1998)
- ECAI, page 98-102. IOS Press, (2002)
- Secondary School Mathematics in the World of Communication Technology, volume 119 of IFIP Conference Proceedings, page 111-120. Chapman & Hall, (1997)


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