%0 Journal Article %A Yu. K. Engelbrecht %T On the problem of description of nonlinear waves in an active medium %J Doklady Akademii Nauk %D 1984 %P 591-594 %V 278 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1984_278_3_a19/ %G ru %F DAN_1984_278_3_a19