@article{10_21136_CMJ_1977_101449,
     author = {Krupka, Demeter},
     title = {A map associated to the {Lepagian} forms on the calculus of variations in fibred manifolds},
     journal = {Czechoslovak Mathematical Journal},
     pages = {114--117},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1977},
     doi = {10.21136/CMJ.1977.101449},
     mrnumber = {0431272},
     zbl = {0373.58004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101449/}
}