@article{SM_1967_1_2_a1,
     author = {P. L. Ul'yanov},
     title = {Absolute and uniform convergence of {Fourier} series},
     journal = {Sbornik. Mathematics},
     pages = {169--197},
     year = {1967},
     volume = {1},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_1_2_a1/}
}