The Fuglede-Putnam theorem and Putnam's inequality for quasi-class (A, k) operators. Gao, Fugen; Fang, Xiaochun — 2011 Annals of Functional Analysis (AFA) [electronic only]
On k -quasiclass A operators. Gao, Fugen; Fang, Xiaochun — 2009 Journal of Inequalities and Applications [electronic only]
A characterization of chaotic order. Yang, Changsen; Gao, Fugen — 2006 Journal of Inequalities and Applications [electronic only]