%0 Journal Article %A V. I. Sedenko %T On the normal form of nonlinear partial differential equations on the real axis %J Sbornik. Mathematics %D 1978 %P 111-117 %V 34 %N 1 %U http://geodesic.mathdoc.fr/item/SM_1978_34_1_a4/ %G en %F SM_1978_34_1_a4