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@article{MS2_1974__34_166345, author = {Soren Johansen}, title = {The {Extremal} {Convex} {Functions.}}, journal = {Mathematica Scandinavica}, pages = {61--68}, publisher = {mathdoc}, volume = {34}, year = {1974}, zbl = {0286.26002}, url = {http://geodesic.mathdoc.fr/item/MS2_1974__34_166345/} }
Soren Johansen. The Extremal Convex Functions.. Mathematica Scandinavica, Tome 34 (1974), pp. 61-68. http://geodesic.mathdoc.fr/item/MS2_1974__34_166345/