Izadi, Sadegh, Sedigheh Jahedi, and Mehdi Dehghanian. “Conditional Equations Related to Drygas Functional Equations”. Annales Mathematicae Silesianae (October 31, 2025). Accessed December 5, 2025. https://journals.us.edu.pl/index.php/AMSIL/article/view/22804.