@article{ZVMMF_1987_27_3_a15,
     author = {V. N. Solov'ev},
     title = {The duality of certain non-convex extremal problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {459--463},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1987_27_3_a15/}
}