%0 Journal Article %A B.G. Eke %T Comparison Domains for the Problem of the Angular Derivative %J Commentarii mathematici Helvetici %D 1971 %P 98-112 %V 46 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1971__46_139464/ %F CMH_1971__46_139464