%0 Journal Article
%A Olli Lehto
%T The spherical derivative of meromorphic functions in the neighbourhood of an isolated singularity.
%J Commentarii mathematici Helvetici
%D 1959
%P 196-205
%V 33
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1959__33_139172/
%F CMH_1959__33_139172