@article{GDZPPN002091623, title = {Zur Transitivit\"at der normalen Flachheit.}, journal = {Inventiones mathematicae}, volume = {29}, year = {1975}, pages = {129-136}, zbl = {0278.14008}, url = {http://dml.mathdoc.fr/item/GDZPPN002091623} }
Herrmann, Manfred; Schmidt, Rolf. Zur Transitivität der normalen Flachheit.. Inventiones mathematicae, Tome 29 (1975) pp. 129-136. http://gdmltest.u-ga.fr/item/GDZPPN002091623/