Chang, Yu-PingReiss, KristinaLin, Fou-Lai2014-01-172014-01-172012http://hdl.handle.net/2003/3233510.17877/DE290R-7995enGesellschaft für Didaktik der Mathematik510Mathematical Proof in German and Taiwanese Textbooks:A Perspective on Geometry at the Lower Secondary Schoolconference contribution