BOUHAFSI, Y.; ECH-CHAD, M.; MISSOURI, M. A Remark on the Range Closures of an Elementary Operator. Methods of Functional Analysis and Topology, [S. l.], v. 27, n. 2, p. 151–156, 2021. DOI: https://doi.org/10.31392/MFAT-npu26_2.2021.04. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/791. Acesso em: 16 dec. 2025.