TY  - JOUR
AU  - Olli Lehto
TI  - The spherical derivative of meromorphic functions in the neighbourhood of an isolated singularity.
JO  - Commentarii mathematici Helvetici
PY  - 1959
SP  - 196
EP  - 205
VL  - 33
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1959__33_139172/
ID  - CMH_1959__33_139172
ER  -