1. IMaST at a glance: Integrated mathematics, science and technology;Center for Mathematics, Science, and Technology,1998
2. Mathematics for literacy;De Lange,2003
3. The four faces of mathematics;Devlin,2000
4. Problem solving as a challenge for mathematics education in The Netherlands;Doorman;ZDM Mathematics Education,2007
5. Mediating between concrete and abstract;Gravemeijer,1997