@article{DE_1968_4_12_a2,
     author = {V. G. Boltyanskii},
     title = {The method of local cross sections in the theory of optimal processes},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2166--2183},
     publisher = {mathdoc},
     volume = {4},
     number = {12},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_12_a2/}
}