@article{SM_2004_195_8_a0,
     author = {A. I. Kozko and A. V. Rozhdestvenskii},
     title = {On~Jackson's inequality for a~generalized modulus of continuity in~$L_2$},
     journal = {Sbornik. Mathematics},
     pages = {1073--1115},
     year = {2004},
     volume = {195},
     number = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2004_195_8_a0/}
}