@article{DAN_1982_263_4_a6,
     author = {P. P. Zabreiko and A. V. Zafievskii},
     title = {On general conditions for a minimum},
     journal = {Doklady Akademii Nauk},
     pages = {798--801},
     publisher = {mathdoc},
     volume = {263},
     number = {4},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_263_4_a6/}
}