@article{SM_2012_203_6_a1,
     author = {A. S. Belov},
     title = {Some properties of the sum of the moduli of the terms of a~grouped trigonometric series},
     journal = {Sbornik. Mathematics},
     pages = {798--825},
     publisher = {mathdoc},
     volume = {203},
     number = {6},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_6_a1/}
}