@article{DA_1975_14_a2,
     author = {F. M. Kirillova and S. V. Streltsov},
     title = {Necessary conditions for optimality of controls in hybrid systems},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {24--33},
     publisher = {mathdoc},
     number = {14},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1975_14_a2/}
}