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- (1998)
- Proceedings CIEAEM 53, page 353--358. Verbania, Italy, CIEAEM, Ghisetti e Corvi Editori, (2002)
- (2001)
- (June 1997)
- International Conference on Engineering Education, Gainesville, Florida, (October 2003)
- Proceedings of CERME 4, Fourth Congress of the European Society for Research in Mathematics Education 17 - 21 February 2005 in Sant Feliu de Guíxols, Spain YERME day: 16- 17 February., ERME, (February 2005)
- Proceedings of the 25th Conference of the International Group for the Psychology of Mathematics Education (PME25), 3, page 49--56. PO Box 9432, 3506 GK Utrecht, The Netherlands, Freudenthal Institute, Faculty of Mathematics and Computer Science, Uthrect University, (July 2001)
- proceedings of 2002 annual meeting of the Canadian Mathematics Education Study Group, page 143--144. Queen's University, (May 2002)
- (2002)
- University of Pisa, Via Buonarroti 2, Pisa, Italy, (November 2004)
- chapter 29, page 757--786. Lawrence Erlbaum Associates publishers, Mahwah, New Jersey, (2002)
- Proceedings of the 2003 Joint Meeting of PME and PMNA (PME27 and PME-NA25), 2, page 173--180. 1776 University Av., Honolulu, HI 96822, International Group for the Psychology of Mathematics Education, College of Education, University of Hawai'i, (July 2003)
- Proceedings of the 22nd Conference of the International Group for the Psychology of Mathematics Education, 1, page 180--195. Stellenbosch, South Africa, PME, University of Stellenbosch, (July 1998)
- (1994)
- (2005)
- The Seventeenth ICMI Study: Technology Revisited (3-8 December 2006), ICMI, (2006)
- Proceedings of the 22nd Conference of the International Group for the Psychology of Mathematics Education, 3, page 279--286. Stellenbosch, South Africa, PME, University of Stellenbosch, (July 1998)
- (July 2003)
- Educational Studies in Mathematics, 39 (1 - 3): 23--44 (July 1999)
- IT-University of Copenhagen as, (February 2005)
