%0 Journal Article %A E. A. Ermolaev %A S. V. Zhestkov %A V. I. Kuvshinov %T Classes of exactly solvable degenerate systems of universal nonlinear partial differential equations %J Differencialʹnye uravneniâ %D 1997 %P 845-846 %V 33 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1997_33_6_a19/ %G ru %F DE_1997_33_6_a19