@article{DAN_1982_262_3_a7,
     author = {P. L. Ul'yanov},
     title = {Some results on series in the {Haar} system},
     journal = {Doklady Akademii Nauk},
     pages = {542--545},
     publisher = {mathdoc},
     volume = {262},
     number = {3},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_262_3_a7/}
}