EL MOCTAR, O. B. $n$-power-Posinormal Operators. Methods of Functional Analysis and Topology, [S. l.], v. 27, n. 1, p. 18–24, 2021. DOI: https://doi.org/10.31392/MFAT-npu26_1.2021.03. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/780. Acesso em: 13 dec. 2025.