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@article{DAN_1987_294_2_a1, author = {F. G. Nasibov}, title = {On extremal problems in the class $B_\sigma$}, journal = {Doklady Akademii Nauk}, pages = {268--271}, publisher = {mathdoc}, volume = {294}, number = {2}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_2_a1/} }
F. G. Nasibov. On extremal problems in the class $B_\sigma$. Doklady Akademii Nauk, Tome 294 (1987) no. 2, pp. 268-271. http://geodesic.mathdoc.fr/item/DAN_1987_294_2_a1/