@article{1103039274, author = {Horn, Alfred and Steinberg, Robert}, title = {Eigenvalues of the unitary part of a matrix.}, journal = {Pacific J. Math.}, volume = {9}, number = {4}, year = {1959}, pages = { 541-550}, language = {en}, url = {http://dml.mathdoc.fr/item/1103039274} }
Horn, Alfred; Steinberg, Robert. Eigenvalues of the unitary part of a matrix.. Pacific J. Math., Tome 9 (1959) no. 4, pp. 541-550. http://gdmltest.u-ga.fr/item/1103039274/