@article{SM_1972_17_3_a6,
     author = {K. I. Oskolkov},
     title = {Subsequences of the {Fourier} sums of functions with a~given modulus of continuity},
     journal = {Sbornik. Mathematics},
     pages = {441--465},
     year = {1972},
     volume = {17},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_17_3_a6/}
}