Pseudo – Normal Operators. Iraqi Journal of Science, [S. l.], v. 48, n. 1, p. 178–181, 2025. DOI: 10.24996/ijs.2007.48.1.%g. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/14646.. Acesso em: 31 jan. 2025.