1. van Lint, J. H. 1994.Selected Lectures from the 7th International Congress on Mathematical Education, Edited by: Robitaille, D. F., Wheeler, D. H. and Kieran, C. 263–270. (Les Presses de I'Université Laval).
2. The introduction of discrete mathematics into the school curriculum
3. Ralston, A. 1990.Proceedings of the First Annual Conference on Technology in Collegiate Mathematics, Edited by: Demana, F. and Waits, B. K. 78–82. Reading, MA: Addison‐Wesley.