MOTRONEA, Gabriela; POPA, Dorian; RAŞA, Ioan. Steklov type operators and functional equations. Annales Mathematicae Silesianae, [S. l.], v. 38, n. 1, p. 57–63, 2024. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/17099. Acesso em: 7 may. 2025.