@article{DE_1989_25_1_a18,
     author = {B. T. Bilalov},
     title = {The basis property of some systems of functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {163--164},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_1_a18/}
}