1. Reasoning in an absurd world: Difficulties with proof by contradiction;Antonini,2006
2. Indirect Proof: What is specific to this way of proving?;Antonini;ZDM −The International Journal on Mathematics Education,2008
3. Using thematic analysis in psychology;Braun;Qualitative Research in Psychology,2006
4. Theory of didactical situations in mathematics;Brousseau,1997
5. Who’s there? A study of students’ reasoning about a proof of existence;Brown;International Journal of Research in Undergraduate Mathematics Education,2007