@article{SM_1975_26_3_a2,
     author = {A. Yu. Petrovich},
     title = {Properties of {Riemann} sums for functions representable by a~trigonometric series with monotone coefficients},
     journal = {Sbornik. Mathematics},
     pages = {331--347},
     year = {1975},
     volume = {26},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_26_3_a2/}
}