Baron, Karol, and Janusz Morawiec. “Note on an Iterative Functional Equation”. Annales Mathematicae Silesianae 38, no. 1 (January 10, 2024): 12–17. Accessed July 4, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/16732.