@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/