%0 Journal Article %A S. M. Ponomarev %T An ill-posed problem in the theory of finite-amplitude waves in %J Doklady Akademii Nauk %D 1983 %P 1105-1108 %V 273 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1983_273_5_a19/ %G ru %F DAN_1983_273_5_a19