@article{GDZPPN002325659, title = {Two Reduction Theorems for Threefold Birational Morphisms.}, journal = {Mathematische Annalen}, volume = {268}, year = {1984}, pages = {13-26}, zbl = {0546.14004}, url = {http://dml.mathdoc.fr/item/GDZPPN002325659} }
Crauder, Bruce. Two Reduction Theorems for Threefold Birational Morphisms.. Mathematische Annalen, Tome 268 (1984) pp. 13-26. http://gdmltest.u-ga.fr/item/GDZPPN002325659/