@article{DE_1977_13_6_a11,
     author = {A. F. Filippov},
     title = {Conditions for the existence of solutions of multivalued differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1070--1078},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_6_a11/}
}