%0 Journal Article %A A. V. Abrosimov %T Complex differential systems and tangential Cauchy--Riemann equations %J Sbornik. Mathematics %D 1985 %P 399-414 %V 50 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1985_50_2_a6/ %G en %F SM_1985_50_2_a6