@article{MAN_1967__171_161566,
     author = {A. LIESEN},
     title = {Feldtheorie in der {Variationsrechnung} mehrfacher {Integrale.} {II.}},
     journal = {Mathematische Annalen},
     pages = {273--292},
     year = {1967},
     volume = {171},
     zbl = {0168.09902},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__171_161566/}
}