@article{GDZPPN002225255,
title = {A criterion for tangential flatness.},
journal = {Manuscripta mathematica},
volume = {43},
year = {1983},
pages = {219-228},
zbl = {0521.13011},
url = {http://dml.mathdoc.fr/item/GDZPPN002225255}
}
Herzog, Bernd. A criterion for tangential flatness.. Manuscripta mathematica, Tome 43 (1983) pp. 219-228. http://gdmltest.u-ga.fr/item/GDZPPN002225255/