@article{DAN_1960_133_3_a1,
     author = {E. G. Gol'shtein},
     title = {A certain class of non-linear extremum problems},
     journal = {Doklady Akademii Nauk},
     pages = {507--510},
     year = {1960},
     volume = {133},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_3_a1/}
}