@article{DAN_1973_210_5_a6,
     author = {E. S. Levitin and A. A. Milyutin and N. P. Osmolovskii},
     title = {On necessary and sufficient conditions for a local minimum in a problem with constraints},
     journal = {Doklady Akademii Nauk},
     pages = {1022--1025},
     publisher = {mathdoc},
     volume = {210},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_210_5_a6/}
}