Operators and Matrices · Volume 12, Issue 2 On the classes of D-normal operators and D-quasi-normal operators on Hilbert space 12-29 Pages 465-487 DOI 10.7153/oam-2018-12-29 Downloads Short PDF Full PDF PNG Authors M. Dana R. Yousefi Keywords Drazin inverse n-normal operators quasi-normal operators n-power quasi-normal operators Subject classes 47B15 47B20 47A15 15A09