@article{DAN_1987_296_1_a17,
     author = {L. V. Berlyand and S. Yu. Dobrokhotov},
     title = {``Operator separation of variables'' in problems of short-wave},
     journal = {Doklady Akademii Nauk},
     pages = {80--84},
     publisher = {mathdoc},
     volume = {296},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_296_1_a17/}
}