[1]FEINGOLD D G,VARGA R S.Block Diagonally Dominant Matrices and Generalizations of the Gerschgorin Circle Theorem [J].Paci. J. Math.,1962(4):1 241-1 250.
[2]BERMAN A,PLEMMONS R J.Nonnegative Matrices in the Mathematics Science [M].New York:Academic Press,1979.