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@article{MZ_1934__38_168508, author = {E. K. Haviland}, title = {A {Note} on the {Extremal} {Surfaces} in the {Calculus} of {Variations}}, journal = {Mathematische Zeitschrift}, pages = {465--467}, publisher = {mathdoc}, volume = {38}, year = {1934}, zbl = {0008.36103}, url = {http://geodesic.mathdoc.fr/item/MZ_1934__38_168508/} }
E. K. Haviland. A Note on the Extremal Surfaces in the Calculus of Variations. Mathematische Zeitschrift, Tome 38 (1934), pp. 465-467. http://geodesic.mathdoc.fr/item/MZ_1934__38_168508/