%0 Journal Article %A Z. J. Jakubowski %A A. Szwankowski %T On some extremal problem in the class of holomorphic symmetric univalent functions %J Commentationes Mathematicae %D 1990 %P 195-207 %V 29 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/cm.v29i2.6271/ %R 10.14708/cm.v29i2.6271 %G pl %F 10_14708_cm_v29i2_6271