J. Dossey. The Nature and Role of Algebra in the K-14 Curriculum: Proceedings of a National Symposium, 17-22, page 17-22. Washington, DC, National Academy Press, (1998)
K. Kahn, E. Sendova, A. Sacristán, and R. Noss. Proceedings of the 7th International Conference on Technology and Mathematics Teaching, Bristol, UK, (2005)
D. Küchemann, and C. Hoyles. The Fourth Conference of the European Society for Research in Mathematics Education (CERME 4), page 438 - 447. Spain, (2005)
Y. Mor, and E. Sendova. 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)
Y. Mor, J. Tholander, and J. Holmberg. The 10th Computer Supported Collaborative Learning (CSCL) conference (2005), page 450 - 459. Taipei, Taiwan, Lawrence Erlbaum Associates, (2006)
A. Sacristán. Representations and Mathematics Visualization. Working Group Representations and Mathematics Visualization (1998-2002), North American Chapter of the International Group for the Psychology of Mathematics Education, page 127-142. (2002)
M. Sasman, A. Olivier, and L. Linchevski. Fifth Annual Congress of the Association for Mathematics Education of South Africa, 1, page 177-182. Port Elizabeth, Port Elizabeth Technikon, (1999)
E. Yackel, and P. Cobb. Nineteenth International Conference for the Psychology of Mathematics Education, page 264-271. Recife, Brazil, Program Committee of the 19th PME Conference, (1995)