@article{ZVMMF_1969_9_3_a4,
     author = {N. V. Banichuk and V. M. Petrov and F. L. Chernous'ko},
     title = {A method of local variations for variational problems with nonadditive functionals},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {548--557},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1969_9_3_a4/}
}