@article{ZNSL_2009_371_a2,
     author = {N. Yu. Dodonov and V. V. Zhuk},
     title = {On approximating periodic functions by {Riesz} sums},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {18--36},
     publisher = {mathdoc},
     volume = {371},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2009_371_a2/}
}