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)
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)
K. Kahn, E. Sendova, A. Sacristán, and R. Noss. Proceedings of the 7th International Conference on Technology and Mathematics Teaching, Bristol, UK, (2005)
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)