TY - JOUR AU - A. M. Abdrakhmanov TI - Elliptic systems that are degenerate at a point JO - Differencialʹnye uravneniâ PY - 1977 SP - 276 EP - 284 VL - 13 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1977_13_2_a5/ LA - ru ID - DE_1977_13_2_a5 ER -