Developing measures of conceptual and procedural fraction and algebra knowledge in grade 9: A pilot study: Meeting of the network "Developing and stimulating competencies: Methodological challenges and opportunities for research"
title = "Developing measures of conceptual and procedural fraction and algebra knowledge in grade 9: A pilot study: Meeting of the network {"}Developing and stimulating competencies: Methodological challenges and opportunities for research{"}",
author = "C. Forsmann and M. D'Erchie and A. Obersteiner and M. Schneider",