TY - JOUR AU - V. P. Serebryakov TI - Index of defect of a symmetric second-order differential operator on the space of vector-functions JO - Matematičeskie zametki PY - 1988 SP - 833 EP - 842 VL - 44 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1988_44_6_a11/ LA - ru ID - MZM_1988_44_6_a11 ER -