Remarks on the Cobordism Group of Surface Diffeomorphisms. A.L. Edmonds; J.H. Ewing — 1982 Mathematische Annalen
Torsion Free Subgroups of Fuchsian Groups and Tessalations of Surfaces. A.L. Edmonds; J.H. Ewing; R. Kulkarni — 1982 Inventiones mathematicae