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@article{CMH_1987__62_140084, author = {F. Ehlers and W.D. Neumann and J. Scherk}, title = {Links of surface singularities and {CR} space forms.}, journal = {Commentarii mathematici Helvetici}, pages = {240--264}, publisher = {mathdoc}, volume = {62}, year = {1987}, zbl = {0626.32032}, url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140084/} }
F. Ehlers; W.D. Neumann; J. Scherk. Links of surface singularities and CR space forms.. Commentarii mathematici Helvetici, Tome 62 (1987), pp. 240-264. http://geodesic.mathdoc.fr/item/CMH_1987__62_140084/