@article{DE_1985_21_4_a6,
     author = {A. Ya. Narmanov and N. N. Petrov},
     title = {Nonlocal problems in the theory of optimal processes. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {605--614},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_4_a6/}
}