@article{IVM_1977_4_a6,
     author = {V. N. Koshelev},
     title = {A~theorem of existence for variational problems on a~set of discontinuous functions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {53--59},
     year = {1977},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1977_4_a6/}
}