@article{DAN_1983_269_3_a0,
     author = {V. F. Babenko},
     title = {Nonsymmetric extremal problems in approximation theory},
     journal = {Doklady Akademii Nauk},
     pages = {521--524},
     publisher = {mathdoc},
     volume = {269},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_269_3_a0/}
}