* Maaß, K., & Doorman, M. (2013). A model for a widespread implementation of inquiry-based learning.''ZDM - The International Journal on Mathematics Education'', 45(6), 887-899. | * Maaß, K., & Doorman, M. (2013). A model for a widespread implementation of inquiry-based learning.''ZDM - The International Journal on Mathematics Education'', 45(6), 887-899. |