%0 Journal Article %A SE. Warschawski %T On boundary derivatives in conformal mapping %J Annales Fennici Mathematici %D 1968 %V 411-420 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1968.420/ %R 10.5186/aasfm.1968.420 %G en %F AFM_1968_411-420_a0