JARCZYK, Justyna; JARCZYK, Witold. On a functional equation appearing on the margins of a mean invariance problem. Annales Mathematicae Silesianae, [S. l.], v. 34, n. 1, p. 96–103, 2020. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/13635. Acesso em: 7 may. 2025.