@article{DE_1994_30_1_a1,
     author = {B. T. Bilalov and Yu. K. Yusifaliev},
     title = {Basis properties of the eigenfunctions of some nonselfadjoint differential operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {20--25},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_1_a1/}
}