1. Matrix Analysis;Horn,1985
2. F.R. Gantmacher, The Theory of Matrices, Vol. II, Chelsea, NY, 1989.
3. Singular values and diagonal elements of complex symmetric matrices;Thompson;Linnear Algebra Appl.,1979
4. Complex symmetric matrices;Craven;J. Austral. Math. Soc.,1968
5. Sur les matrices hypohermitiennes et surles matrices unitaires;Autonne;Ann. Univ. Lyon Nouvelle Série I, Fasc.,1915