TAJMOUATI, Abdelaziz; EL BERRAG, Mohammed. DISJOINT J-CLASS OPERATORS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 37, p. 19–28, 2017. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6747. Acesso em: 16 sep. 2026.