@article{DE_1973_9_5_a8,
     author = {N. N. Petrov},
     title = {The absence of the value of a pursuit game},
     journal = {Differencialʹnye uravneni\^a},
     pages = {860--867},
     year = {1973},
     volume = {9},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_5_a8/}
}