%0 Journal Article %A V. I. Volkov %A A. A. Dyachenko %A O. E. Shushpanov %T Two-mode theory of filtering wave beam guide. The trajectory method %J Doklady Akademii Nauk %D 1973 %P 299-302 %V 213 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1973_213_2_a12/ %G ru %F DAN_1973_213_2_a12