@article{CMFD_2007_25_a1,
     author = {A. S. Belov},
     title = {On {Conditions} of the {Average} {Convergence} {(Upper} {Boundedness)} of {Trigonometric} {Series}},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {8--20},
     publisher = {mathdoc},
     volume = {25},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2007_25_a1/}
}