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@article{MS2_1981__48_166749, author = {J.M. Borwein}, title = {A {Lagrange} multiplier theorem and a sandwich theorem for convex relations.}, journal = {Mathematica Scandinavica}, pages = {189--204}, publisher = {mathdoc}, volume = {48}, year = {1981}, zbl = {0468.49007}, url = {http://geodesic.mathdoc.fr/item/MS2_1981__48_166749/} }
J.M. Borwein. A Lagrange multiplier theorem and a sandwich theorem for convex relations.. Mathematica Scandinavica, Tome 48 (1981), pp. 189-204. http://geodesic.mathdoc.fr/item/MS2_1981__48_166749/