„GROUPS OF OPERATORS IN C2 DETERMINED BY SOME COSINE OPERATOR FUNCTIONS IN C2“ (2020) Balkan Journal of Applied Mathematics and Informatics, 3(1), S. pp. 63–72. Verfügbar unter: https://js.ugd.edu.mk/index.php/bjami/article/view/3517 (Zugegriffen: 3 Oktober 2025).