@article{DAN_1991_317_5_a8,
     author = {A. A. Krasovskii},
     title = {Nonclassical optimization and the qualitative theory of optimal},
     journal = {Doklady Akademii Nauk},
     pages = {1062--1065},
     year = {1991},
     volume = {317},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_5_a8/}
}