@article{DAN_1968_180_6_a11,
     author = {V. V. Laricheva and M. V. Rein},
     title = {Multivalued extremal solutions in optimal control problems},
     journal = {Doklady Akademii Nauk},
     pages = {1309--1311},
     publisher = {mathdoc},
     volume = {180},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_180_6_a11/}
}