TY - JOUR AU - A. V. Abrosimov TI - Complex differential systems and tangential Cauchy--Riemann equations JO - Sbornik. Mathematics PY - 1985 SP - 399 EP - 414 VL - 50 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1985_50_2_a6/ LA - en ID - SM_1985_50_2_a6 ER -