@article{SM_1981_38_1_a1,
     author = {P. L. Ul'yanov},
     title = {On {Fourier} coefficients},
     journal = {Sbornik. Mathematics},
     pages = {11--29},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1981_38_1_a1/}
}