@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/