@article{ZVMMF_1985_25_1_a2,
     author = {M. I. Sumin},
     title = {Sufficient conditions for elements of minimizing sequences in optimal control problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {23--31},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1985_25_1_a2/}
}