TY - JOUR AU - A. A. Abramenko AU - V. I. Lahno AU - A. M. Samoilenko TI - Group Classification of Nonlinear Evolutionary Equations: II.~Invariance Under Solvable Groups of Local Transformations JO - Differencialʹnye uravneniâ PY - 2002 SP - 482 EP - 489 VL - 38 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2002_38_4_a6/ LA - ru ID - DE_2002_38_4_a6 ER -