TY - JOUR AU - L. GÄrding TI - Some trends and problems in linear partial differential equations JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1960 VL - 15 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1960_15_1_a2/ LA - ru ID - RM_1960_15_1_a2 ER -