%0 Journal Article %A S. G. Gindikin %T Tubular regions and correctness classes for the Cauchy problem %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1968 %V 23 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1968_23_3_a10/ %G ru %F RM_1968_23_3_a10