%0 Journal Article %A V. I. Lahno %A A. M. Samoilenko %T Group Classification of Nonlinear Evolution Equations: I.~Invariance Under Semisimple Local Transformation Groups %J Differencialʹnye uravneniâ %D 2002 %P 365-372 %V 38 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2002_38_3_a10/ %G ru %F DE_2002_38_3_a10