@article{DE_1995_31_6_a15,
     author = {S. Ya. Serovaǐskiǐ},
     title = {Necessary conditions for an extremum in the case of the nondifferentiability of the state function with respect to the control},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1055--1059},
     publisher = {mathdoc},
     volume = {31},
     number = {6},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_6_a15/}
}