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@article{CMH_1965__40_139298, author = {J. Clunie and W.K. Hayman}, title = {The spherical derivative of integral and meromorphic functions.}, journal = {Commentarii mathematici Helvetici}, pages = {117--148}, publisher = {mathdoc}, volume = {40}, year = {1965}, zbl = {0142.04303}, url = {http://geodesic.mathdoc.fr/item/CMH_1965__40_139298/} }
J. Clunie; W.K. Hayman. The spherical derivative of integral and meromorphic functions.. Commentarii mathematici Helvetici, Tome 40 (1965), pp. 117-148. http://geodesic.mathdoc.fr/item/CMH_1965__40_139298/