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@article{MZ_1958__70_169776, author = {Ky Fan}, title = {On the {Equilibrium} {Value} of a {System} of {Convex} and {Concave} {Functions.}}, journal = {Mathematische Zeitschrift}, pages = {271--280}, publisher = {mathdoc}, volume = {70}, year = {1958}, zbl = {0083.28605}, url = {http://geodesic.mathdoc.fr/item/MZ_1958__70_169776/} }
Ky Fan. On the Equilibrium Value of a System of Convex and Concave Functions.. Mathematische Zeitschrift, Tome 70 (1958), pp. 271-280. http://geodesic.mathdoc.fr/item/MZ_1958__70_169776/