@article{AM2_1974__11_136461,
     author = {Hanno Rund},
     title = {Integral {Formulae} {Associated} with the {Euler-Lagrange} {Operators} of {Multiple} {Integral} {Problems} in the {Calculus} of {Variations.}},
     journal = {Aequationes mathematicae},
     pages = {212--229},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     zbl = {0293.49001},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136461/}
}