1. Spatial ability: An information processing approach to psychometrics;Carpenter,1986
2. Constructivism and activity theory: A consideration of their similarities and differences as they relate to mathematics education;Cobb,1992
3. Meaning: Image schemata and protocols;Dörfler,1991
4. On the status of visual reasoning in mathematics and mathematics education;Dreyfus,1991
5. Intuition in science and mathematics: An educational approach;Fischbein,1987