@article{DAN_1966_171_1_a10,
     author = {L. Neishtadt},
     title = {General theory of variational problems with applications to optimal control},
     journal = {Doklady Akademii Nauk},
     pages = {48--50},
     publisher = {mathdoc},
     volume = {171},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_171_1_a10/}
}