@article{IVM_2007_12_a3,
     author = {D. Krupka},
     title = {The structure of the {Euler--Lagrange} mapping},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {51--69},
     publisher = {mathdoc},
     number = {12},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2007_12_a3/}
}