@article{GDZPPN00228667X,
title = {Some Equalities in a Unitary Space leading to Equalities concerning Singular Values of Sets of Matrices.},
journal = {Mathematische Annalen},
volume = {136},
year = {1958},
pages = {388-390},
zbl = {0082.24406},
url = {http://dml.mathdoc.fr/item/GDZPPN00228667X}
}
Amir-Moéz, A.R. Some Equalities in a Unitary Space leading to Equalities concerning Singular Values of Sets of Matrices.. Mathematische Annalen, Tome 136 (1958) pp. 388-390. http://gdmltest.u-ga.fr/item/GDZPPN00228667X/