1. Some historical issues and paradoxes regarding the concept of infinity: an APOS-based analysis: part 1;Dubinsky;Educ. Stud. Math.,2005
2. Some historical issues and paradoxes regarding the concept of infinity: an APOS-based analysis: part 2;Dubinsky;Educ. Stud. Math.,2005
3. Envisioning the infinite by projecting finite properties;Ely;J. Math. Behav.,2011
4. The intuition of infinity;Fischbein;Educ. Stud. Math.,1979