@article{10_4153_CJM_1968_062_1,
     author = {Rund, H.},
     title = {A {Geometrical} {Theory} of {Multiple} {Integral} {Problems} in the {Calculus} of {Variations}},
     journal = {Canadian journal of mathematics},
     pages = {639--657},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-062-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-062-1/}
}