%0 Journal Article %A Yu. V. Titarenko %T The Cauchy problem for nonanalytic Pfaffian systems %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1975 %V 30 %N 6 %U http://geodesic.mathdoc.fr/item/RM_1975_30_6_a24/ %G ru %F RM_1975_30_6_a24