AKKAOUI, Ahmed; EL FATINI, Mohamed; FADLI, Brahim. A variant of d’Alembert’s functional equation on semigroups with endomorphisms. Annales Mathematicae Silesianae, [S. l.], v. 36, n. 1, p. 1–14, 2022. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/13456. Acesso em: 7 may. 2025.