@article{DAN_1964_159_4_a5,
     author = {M. G. Dzhavadov},
     title = {On the completeness of certain of the eigenfunctions of a non-selfadjoint differential operator},
     journal = {Doklady Akademii Nauk},
     pages = {723--725},
     publisher = {mathdoc},
     volume = {159},
     number = {4},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_4_a5/}
}