AKKAOUI, Ahmed; FADLI, Brahim. New results about quadratic functional equation on semigroups. Annales Mathematicae Silesianae, [S. l.], v. 39, n. 2, p. 209–222, 2024. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/18119. Acesso em: 16 dec. 2025.