@article{IVM_1970_12_a4,
     author = {V. N. Koshelev and S. F. Morozov},
     title = {Necessary conditions for the extremum of variational problems in nonparametric form on the collection of discontinuous functions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {37--46},
     publisher = {mathdoc},
     number = {12},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_12_a4/}
}