@article{SM_1979_35_4_a4,
     author = {E. A. Sevast'yanov},
     title = {Rational approximation and absolute convergence of {Fourier} series},
     journal = {Sbornik. Mathematics},
     pages = {509--525},
     year = {1979},
     volume = {35},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1979_35_4_a4/}
}