@article{DAN_1960_133_5_a6,
     author = {A. M. Olevskii},
     title = {Coefficients of convergent orthogonal series in complete systems of functions},
     journal = {Doklady Akademii Nauk},
     pages = {1021--1024},
     publisher = {mathdoc},
     volume = {133},
     number = {5},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_5_a6/}
}