@article{DAN_1988_301_5_a5,
     author = {A. M. Sedletskii},
     title = {Convergence of anharmonic {Fourier} series in systems of},
     journal = {Doklady Akademii Nauk},
     pages = {1053--1056},
     publisher = {mathdoc},
     volume = {301},
     number = {5},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_301_5_a5/}
}