@article{SM_1979_35_6_a2,
     author = {N. N. Krasovskii},
     title = {Differential games. {Approximation} and formal models},
     journal = {Sbornik. Mathematics},
     pages = {795--822},
     year = {1979},
     volume = {35},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1979_35_6_a2/}
}