@article{TRSPY_1987_180_a9,
     author = {A. G. Babenko},
     title = {A~sharp constant in the {Jackson} inequality in $L^2$ in the case of a~small argument of the modulus of continuity},
     journal = {Informatics and Automation},
     pages = {32--33},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a9/}
}