%0 Journal Article %A L. V. Berlyand %A S. Yu. Dobrokhotov %T ``Operator separation of variables'' in problems of short-wave %J Doklady Akademii Nauk %D 1987 %P 80-84 %V 296 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1987_296_1_a17/ %G ru %F DAN_1987_296_1_a17