%0 Journal Article %A A. A. Gonchar %T A local condition of single-valuedness of analytic functions %J Sbornik. Mathematics %D 1972 %P 151-167 %V 18 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1972_18_1_a9/ %G en %F SM_1972_18_1_a9