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- proceedings of the 1st CSCL SIG Symposium, Lausanne, Switzerland, (2004)
- Journal of the Learning Sciences 3(3):265-283 (1994)
- Educational Studies in Mathematics 42(3):237-268 (2000)
- Nineteenth International Conference for the Psychology of Mathematics Education, page 264-271. Recife, Brazil, Program Committee of the 19th PME Conference, (1995)
- the Sixteenth Annual International Conference on Technology in Collegiate Mathematics, Chicago, (2003)


