@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/