@article{DE_1986_22_6_a3,
     author = {E. S. Polovinkin and G. V. Smirnov},
     title = {An approach to differentiation of multivalued mappings, and necessary conditions for optimality of solutions of differential inclusions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {944--954},
     year = {1986},
     volume = {22},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_6_a3/}
}