Tönisson, E. und Lepp, M. (2014) „Students’ Comparison of Their Trigonometric Answers with the Answers of a Computer Algebra System in Terms of Equivalence and Correctness“, R&E-SOURCE, 1. Verfügbar unter: https://journal.ph-noe.ac.at/index.php/resource/article/view/85 (Zugegriffen: 27 April 2024).