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@article{MS2_1974__34_166346, author = {Jochem Zowe}, title = {Subdifferentiability of {Convex} {Functions} with {Values} in an {Ordered} {Vector} {Space.}}, journal = {Mathematica Scandinavica}, pages = {69--83}, publisher = {mathdoc}, volume = {34}, year = {1974}, zbl = {0288.46007}, url = {http://geodesic.mathdoc.fr/item/MS2_1974__34_166346/} }
Jochem Zowe. Subdifferentiability of Convex Functions with Values in an Ordered Vector Space.. Mathematica Scandinavica, Tome 34 (1974), pp. 69-83. http://geodesic.mathdoc.fr/item/MS2_1974__34_166346/