@article{DAN_1963_149_4_a0,
     author = {A. Ya. Dubovitskii and A. A. Milyutin},
     title = {Extremum problems with certain constraints},
     journal = {Doklady Akademii Nauk},
     pages = {759--762},
     publisher = {mathdoc},
     volume = {149},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_4_a0/}
}