TY - JOUR AU - U. Khou-sin' TI - On the definition of parabolic systems of partial differential equations JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1960 VL - 15 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1960_15_6_a9/ LA - ru ID - RM_1960_15_6_a9 ER -