TY - JOUR AU - S. M. Ponomarev TI - An ill-posed problem in the nonlinear theory of waves JO - Doklady Akademii Nauk PY - 1986 SP - 58 EP - 63 VL - 288 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1986_288_1_a12/ LA - ru ID - DAN_1986_288_1_a12 ER -