ŁUKASIK, Radosław. Invariant means on Banach spaces. Annales Mathematicae Silesianae, [S. l.], v. 31, p. 127–140, 2016. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/13944. Acesso em: 5 dec. 2025.