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math.AG2003
On the Group of Automorphisms of Cyclic Covers of the Riemann Sphere
Sadok Kallel, Denis Sjerve
This note uses some recent calculations of Conder and Bujalance (on classifying finite index group extensions of Fuchsian groups with abelian quotient and torsion free kernel) in o…
math.AG1999
Genus Zero Actions on Riemann Surfaces
Sadok Kallel, Denis Sjerve
In this paper we determine all finite groups G that can act on some compact Riemann surface M with the property that if H is any non-trivial subgroup of G, then the orbit surface M…