@article{SM_2017_208_6_a6,
     author = {A. Yu. Popov and A. P. Solodov},
     title = {The negative parts of the sums of~sine~series with quasimonotonic coefficients},
     journal = {Sbornik. Mathematics},
     pages = {878--901},
     year = {2017},
     volume = {208},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_6_a6/}
}