@article{MZM_1993_54_2_a15,
     author = {V. I. Ivanov},
     title = {On the approximation of functions in spaces $L_p$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {151--154},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_2_a15/}
}