Geodesic
Univalence discs of meromorphic functions
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1983), pp. 22-24

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Let a nonconstant meromorphic function map the complex plane onto a Riemann surface $R$ over the Riemann sphere. We find the lower bound of the supremum of the radii of schlicht disks on $R$. We compare this bound with similar bounds of L. Ahlfors and Ch. Pommerenke. 
@article{VMUMM_1983_1_a5,
     author = {I. B. Oshkin},
     title = {Univalence discs of meromorphic functions},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {22--24},
     publisher = {mathdoc},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1983_1_a5/}
}
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I. B. Oshkin. Univalence discs of meromorphic functions. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1983), pp. 22-24. http://geodesic.mathdoc.fr/item/VMUMM_1983_1_a5/