@article{1103044390, author = {Wielandt, Helmut}, title = {On eigenvalues of sums of normal matrices.}, journal = {Pacific J. Math.}, volume = {5}, number = {4}, year = {1955}, pages = { 633-638}, language = {en}, url = {http://dml.mathdoc.fr/item/1103044390} }
Wielandt, Helmut. On eigenvalues of sums of normal matrices.. Pacific J. Math., Tome 5 (1955) no. 4, pp. 633-638. http://gdmltest.u-ga.fr/item/1103044390/