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2. On Fenchel's conjecture about F-groups;Fox;Mat. Tidsskr. B,1952
3. The Eulerian functions of a group;Hall;Quart. J. Math. Oxford Ser.,1936
4. Cyclic groups of automorphisms of a compact Riemann surface;Harvey;Quart. J. Math. Oxford Ser.,1966
5. Some Combinatorial Problems in the Theory of Riemann Surface Transformation Groups;Lloyd,1967