@article{GDZPPN002090333,
title = {A Flatness Criterion in Grothendieck Categories.},
journal = {Inventiones mathematicae},
volume = {20},
year = {1973},
pages = {331-336},
zbl = {0257.18020},
url = {http://dml.mathdoc.fr/item/GDZPPN002090333}
}
Ulmer, Friedrich. A Flatness Criterion in Grothendieck Categories.. Inventiones mathematicae, Tome 20 (1973) pp. 331-336. http://gdmltest.u-ga.fr/item/GDZPPN002090333/