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@article{MZ_1987__194_173812, author = {Ky Fan}, title = {Sharpened {Forms} of an {Inequality} of {Von} {Neumann.}}, journal = {Mathematische Zeitschrift}, pages = {7--14}, publisher = {mathdoc}, volume = {194}, year = {1987}, zbl = {0631.47004}, url = {http://geodesic.mathdoc.fr/item/MZ_1987__194_173812/} }
Ky Fan. Sharpened Forms of an Inequality of Von Neumann.. Mathematische Zeitschrift, Tome 194 (1987), pp. 7-14. http://geodesic.mathdoc.fr/item/MZ_1987__194_173812/