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@article{CMH_1990__65_3_140196, author = {Fernando Serrano}, title = {Multiple fibres of a morphism.}, journal = {Commentarii mathematici Helvetici}, pages = {287--298}, publisher = {mathdoc}, volume = {65}, number = {3}, year = {1990}, zbl = {0714.14008}, url = {http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140196/} }
Fernando Serrano. Multiple fibres of a morphism.. Commentarii mathematici Helvetici, Tome 65 (1990) no. 3, pp. 287-298. http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140196/