@article{DAN_1986_290_5_a0,
     author = {V. F. Babenko},
     title = {Extremal problems in approximation theory and inequalities for},
     journal = {Doklady Akademii Nauk},
     pages = {1033--1036},
     publisher = {mathdoc},
     volume = {290},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_290_5_a0/}
}