MECHERI , S.; PRASAD , T. Fuglede – Putnam type theorems for extension of $M$-hyponormal operators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 1, p. 89 – 98, 2022. DOI: 10.37863/umzh.v74i1.2355. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2355. Acesso em: 5 dec. 2025.