- History and Education in Mathematics and Informatics, Attracting Talent to Science; Proceedings of the International Congress MASSEE 2003, september 15-21, Borovets, Bulgaria, University of Latvia, Latvia, (2003)
- The 10th Computer Supported Collaborative Learning CSCL conference 2005, page 450 - 459. Taipei, Taiwan, Lawrence Erlbaum Associates, (2006)
- proceedings of the 1st CSCL SIG Symposium, Lausanne, Switzerland, (2004)
- the International Journal for Technology in Mathematics Education 13(2):65-78 (2006)
- Fourth Congress of the European Society for Research in Mathematics Education CERME-4, Sant Feliu de Guíxols, Spain, (2005)
- Micromath 20(2):17-23 (2004)
- Proceedings of the Fourth Congress of the European Society for Research in Mathematics Education, page 1061-1070. (2005)
- Journal of Visual Languages and Computing 19(5):574-597 (2008)
- International Journal of Continuing Engineering Education and Life Long Learning 12(5):521-540 (2002)
- Informatics in Education 6(2):307-320 (2007)
- (2005)
- Journal of Computer Assisted Learning 21(2):143-158 (April 2005)
- Journal of Computer Assisted Learning 22(2):114-136 (2006)
- IDC '04: Proceeding of the 2004 conference on Interaction design and children, page 141-142. New York, NY, ACM Press, (2004)
- Journal of Visual Languages and Computing 7(2):197-217 (1996)
- project report, London Knowledge Lab, (2007)
- Proceedings of the 2006 ACM symposium on Software visualization (2006)
- 5th CERME conference - congress of European Society for Research in Mathematics Education, Larnaca, Cyprus, (2007)
- (2001)
- Proceedings of the Fourth Congress of the European Society for Research in Mathematics Education CERME 4, page 591-600. Sant Feliu de Guíxols, Spain,, (2005)


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