Operators and Matrices · Volume 11, Issue 3 Spectrum of (n,k)-quasiparanormal operators 11-59 Pages 831-844 DOI 10.7153/oam-11-59 Downloads Short PDF Full PDF PNG Authors Jiangtao Yuan Caihong Wang Keywords paranormal operator isolated spectral point point spectrum Riesz idempotent approximate point spectrum Subject classes 47B20 47A10 47A63