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@article{AM2_1971__7_136250, author = {E.T. DAVIES}, title = {A {Geometrical} {Theory} of {Multiple} {Integral} {Problems} in the {Calculus} of {Variations}}, journal = {Aequationes mathematicae}, pages = {173--181}, publisher = {mathdoc}, volume = {7}, year = {1971}, zbl = {0232.49010}, url = {http://geodesic.mathdoc.fr/item/AM2_1971__7_136250/} }
E.T. DAVIES. A Geometrical Theory of Multiple Integral Problems in the Calculus of Variations. Aequationes mathematicae, Tome 7 (1971), pp. 173-181. http://geodesic.mathdoc.fr/item/AM2_1971__7_136250/