@article{MAN_1958__135_160629,
     author = {A.R. Amir-Mo\'ez},
     title = {Some {Equalities} in a {Unitary} {Space} leading to {Equalities} concerning {Singular} {Values} of {Sets} of {Matrices.}},
     journal = {Mathematische Annalen},
     pages = {388--390},
     publisher = {mathdoc},
     volume = {135},
     year = {1958},
     zbl = {0082.24406},
     url = {http://geodesic.mathdoc.fr/item/MAN_1958__135_160629/}
}