[1] 王桂松，吴密霞，贾忠贞.矩阵不等式[M].北京:科学出版社,2006：23-56.
[2] GRONE ROBERT,JOHNSON CHARLES R,SA EDUARDO M,et al.Normal Matrices[J].Linear Algebra and Its Applications,1987,87:213-225.
[3] ELSNER L,IKRAMOV KH D.Normal Matrices:An Update[J].Linear Algebra and Its Applications,1998,285(1/2/3):291-303.
[4] HORN ROGER A,JOHNSON CHARLES R.Matrix Analysis[M].Cambridge:Cambridge University Press,1985:47-80.
[5] HORN ROGER A,JOHNSON CHARLES R.Topics in Matrix Analysis[M].Cambridge:Cambridge University Press,1991:67-89.
[6] ZHANG Fuzhen.Matrix Theory:Basic Results and Techniques[M].Berlin:Spinger,2011:26-76.
[7] SUI Xuefang,GONDOLO PAOLO.Factorizations into Normal Matrices in Indefinite Inner Product Spaces[J].Linear Algebra and Its Applications,2016,516(17):143-166.
[8] MEHL CHRISTIAN,RODMAN LEIBA.Classes of Normal Matrices in Indefinite Inner Products[J].Linear Algebra and Its Applications,2001,336(1/2/3):71-98.
[9] BLEHER PAVEL M,KUIJLAARS ARNO B J.Orthogonal Polynomials in the Normal Matrix Model with a Cubic Potential[J].Advances in Mathematics,2012,230(3):1 272-1 321.

[10] CHAU LING-LIE,ZABORONSKY OLEG.On the Structure of Correlation Functions in the Normal Matrix Model[J].Communications in Mathematical Physics,1998,196(1):203-247.
[11] RUHE AXEL.Closest Normal Matrix Finally Found[J].BIT Numerical Mathematics,1987,27(4):585-598.
[12] HOFFMAN A J,WIELANDT H W.The Variation of the Spectrum of a Normal Matrix[J].Duke Mathematical Journal,1953,20(1):37-39.