@article{TIMM_1992_1_a6,
     author = {S. B. Stechkin},
     title = {On the order of approximation of functions},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {90--96},
     publisher = {mathdoc},
     volume = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_1992_1_a6/}
}