@article{DAN_1987_296_4_a3,
     author = {I. I. Ibragimov and F. I. Ibragimov},
     title = {Multiple completeness in the sense of {M.} {V.} {Keldysh} of some},
     journal = {Doklady Akademii Nauk},
     pages = {788--791},
     year = {1987},
     volume = {296},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_296_4_a3/}
}