Mecheri S. and Prasad T. 2022. Fuglede – Putnam type theorems for extension of $M$-hyponormal operators. Ukrains’kyi Matematychnyi Zhurnal. 74, 1 (Jan. 2022), 89 - 98. DOI:https://doi.org/10.37863/umzh.v74i1.2355.