OGUNSOLA, O. J.; DANIEL, I. E. Pseudo-amenability and pseudo-contractibility of restricted semigroup algebra. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 17, p. 89–102, 2018. Disponível em: https://studmath.uken.krakow.pl/article/view/12963. Acesso em: 21 jul. 2026.