%0 Journal Article %A S. P. Tsarev %A E. S. Shemyakova %T Differential Transformations of Parabolic Second-Order Operators in the Plane %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2009 %P 227-236 %V 266 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_2009_266_a12/ %G ru %F TM_2009_266_a12