@article{TRSPY_1945_15_a0,
     author = {S. M. Nikol'skii},
     title = {Approximations of periodic functions by trigonometrical polynomials},
     journal = {Informatics and Automation},
     pages = {3--76},
     publisher = {mathdoc},
     volume = {15},
     year = {1945},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1945_15_a0/}
}