Yerushalmy, M., Katriel, H. & Shternberg, B. (2002/4) VisualMath: Function. Interactive Mathematics Text. (in Hebrew (2002) and English (2004)) Published by CET: The Centre of Educational Technology, Ramat-Aviv. www.cet.ac.il/math/function/english, www.cet.ac.il/math/function
Schwartz, J.L., Yerushalmy, M. & Wilson, B. (eds.) (1993) The Geometric Supposer: What is it a case of? Lawrence Erlbaum Inc., NJ.