1. Doctoral students’ use of examples in evaluating and proving conjectures;Alcock;Educational Studies in Mathematics,2008
2. Aspects of proof in pupils’ practice of school mathematics;Balacheff,1988
3. Ball, D., Hoyles, C., Jahnke, H., & Movshovitz-Hadar, N. (August, 2002). The teaching of proof. Paper presented at the International Congress of Mathematicians, Beijing, China.
4. Exemplification in mathematics education;Bills,2006
5. Bressound, D. M. (2006, April). Launching from the CUPM curriculum guide: The transition to proof. http://www.maa.org/columns/launchings/launchings_04_06.html#ref1.