Spectral variation bounds for diagonalisable matrices. R. Bhatia; L. Elsner; G.M. Krause — 1997 Aequationes mathematicae
Some inequalities for commutators and an application to spectral variation. R. Bhatia; Ch. Davis; F. Kittaneh — 1990 Aequationes mathematicae
Some inequalities for commutators and an application to spectral variation. R. Bhatia; F. Kittaneh; C. Davis — 1991 Aequationes mathematicae