@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/}
}