@article{VSPUI_2018_14_1_a6,
     author = {M. S. Nikolskii and E. A. Belyaevskikh},
     title = {L. {S.} {Pontryagin} maximum principle for some optimal control problems by trajectories pencils},
     journal = {Vestnik Sankt-Peterburgskogo universiteta. Prikladna\^a matematika, informatika, processy upravleni\^a},
     pages = {59--68},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSPUI_2018_14_1_a6/}
}