[2] SUN J G,CHEN C H. Generalized polar decomsition[J]. Journal of computational mathematics,1989(3):262-273.
[3] MARSHALL A W,OLKIN I. Inequalities:theory of majoration and its applications[J]. New York:Academic Press,1979.
[4] WEISS G. The Fuglede commutativity theorem modulo the Hilbert-Schmidt class and generating functions for matrix operators,I,II[J]. Trans Amer Math Soc,1978,246:193-209.
[5] LI RCC. New perturbation bounds for the unitary polar factor[J]. SIAM J Matrix Annl Appl,1995,16:327-332.
[6] RAJENDRA R,CHANDLER D,FUAD K. Some inequalities for commutators and an applications to spectral variation[J]. Aequationes mathematicae,1991,41:70-78.
[7] DAVIS C,KAHAN W M. The rotation of eigenvectors by a perturbation[J]. SIAM J Numer Anal,1970(1):1-46.