@article{DAN_1983_272_1_a3,
     author = {V. I. Ivanov},
     title = {Coefficients of universal and null orthogonal series},
     journal = {Doklady Akademii Nauk},
     pages = {19--23},
     publisher = {mathdoc},
     volume = {272},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_272_1_a3/}
}