@article{DAN_1988_302_3_a5,
     author = {G. V. Smirnov},
     title = {Extremal problems for differential inclusions with phase},
     journal = {Doklady Akademii Nauk},
     pages = {541--544},
     publisher = {mathdoc},
     volume = {302},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_302_3_a5/}
}