%0 Journal Article %A Jörg Winkler %A Sakari Toppila %T On the Spherical Derivative of a Meromorphic Function with a Valiron Deficient Value. %J Mathematische Zeitschrift %D 1982 %P 545-552 %V 180 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1982__180_173211/ %F MZ_1982__180_173211