@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/