@article{GDZPPN002312859, title = {Birational Morphisms Factorizable by two Monoidal Transformations.}, journal = {Mathematische Annalen}, volume = {219}, year = {1976}, pages = {23-28}, zbl = {0309.14009}, url = {http://dml.mathdoc.fr/item/GDZPPN002312859} }
Schaps, Mary. Birational Morphisms Factorizable by two Monoidal Transformations.. Mathematische Annalen, Tome 219 (1976) pp. 23-28. http://gdmltest.u-ga.fr/item/GDZPPN002312859/