Katja Derr

发表

MathX 3 - Online Self Assessment of Basic Knowledge of Mathematics

Dirk Saller, Katja Derr, Tanja Fried, 2009 .

Identifying Consistent Variables in a Heterogeneous Data Set: Evaluation of a Web-Based Pre-Course in Mathematics.

Katja Derr, Katja Derr, 2017 .