TY - JOUR AU - V. I. Sedenko TI - On the normal form of nonlinear partial differential equations on the real axis JO - Sbornik. Mathematics PY - 1978 SP - 111 EP - 117 VL - 34 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1978_34_1_a4/ LA - en ID - SM_1978_34_1_a4 ER -