@article{GDZPPN002338580, title = {Two theorems on elementary contractions.}, journal = {Mathematische Annalen}, volume = {295}, year = {1993}, pages = {191-198}, zbl = {0789.14011}, url = {http://dml.mathdoc.fr/item/GDZPPN002338580} }
Andreatta, M.; Ballico, E. Two theorems on elementary contractions.. Mathematische Annalen, Tome 295 (1993) pp. 191-198. http://gdmltest.u-ga.fr/item/GDZPPN002338580/