1. On isolated rational singularities of surfaces;Artin;Am. J. Math.,1966
2. Rationale Singularitaten komplexen Flachen;Brieskorn;Inventiones Math.,1968
3. Uber modifikationen und exzeptionelle analytische Mengen;Grauert;Math. Ann.,1962
4. The Theory of Groups;Hall,1959
5. The topology of normal singularities of an algebraic surface (d'aprés Mumford;Hirzebruch;Séminaire Bourbaki,1962