TAKAHASHI, W.; TO-MING LAU, A. Invariant means and fixed point properties for non-expansive representations of topological semigroups. Topological Methods in Nonlinear Analysis, [S. l.], v. 5, n. 1, p. 39–57, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.003. Acesso em: 22 jul. 2024.