@article{DAN_1963_149_3_a11,
     author = {P. L. Ul'yanov},
     title = {Series with respect to the {Haar} system},
     journal = {Doklady Akademii Nauk},
     pages = {532--534},
     publisher = {mathdoc},
     volume = {149},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_3_a11/}
}