By Li Yeping   Kulm Gerald   in ZDM

ISSN:1863-9690|40|5|833-843

Springer Publishing Company ‎(2008)‎

Access to resources Favorite 16.572529

By An Shuhua   Kulm Gerald   Wu Zhonghe   in Journal of Mathematics Teacher Education

ISSN:1386-4416|7|2|145-172

Springer Publishing Company ‎(2004)‎

Access to resources Favorite 14.500963