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@article{JRAM_1972__252_151173, author = {Stephen Dragosh}, title = {The spherical derivative of meromorphic functions.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {51--67}, publisher = {mathdoc}, volume = {252}, year = {1972}, zbl = {0226.30033}, url = {http://geodesic.mathdoc.fr/item/JRAM_1972__252_151173/} }
Stephen Dragosh. The spherical derivative of meromorphic functions.. Journal für die reine und angewandte Mathematik, Tome 252 (1972), pp. 51-67. http://geodesic.mathdoc.fr/item/JRAM_1972__252_151173/