%0 Journal Article %A E. V. Ferapontov %T Autotransformations with respect to the solution, and hydrodynamic symmetries %J Differencialʹnye uravneniâ %D 1991 %P 1250-1263 %V 27 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1991_27_7_a17/ %G ru %F DE_1991_27_7_a17