@article{DE_1979_15_5_a4,
     author = {N. N. Petrov},
     title = {Continuity of the {Bellman} function in degenerate cases},
     journal = {Differencialʹnye uravneni\^a},
     pages = {809--814},
     year = {1979},
     volume = {15},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_5_a4/}
}