%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 %V 46 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/CMH_1971__46_139464/ %G un %F CMH_1971__46_139464