@article{01973852, title = {Contractions of }, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {44}, year = {2003}, pages = {581-603}, zbl = {1032.22004}, language = {en}, url = {http://dml.mathdoc.fr/item/01973852} }
Cahen, Benjamin. Contractions of . Beiträge zur Algebra und Geometrie, Tome 44 (2003) pp. 581-603. http://gdmltest.u-ga.fr/item/01973852/