Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1986__33_134818, author = {F. Otto}, title = {On two problems related to cancellativity.}, journal = {Semigroup forum}, pages = {331--356}, publisher = {mathdoc}, volume = {33}, year = {1986}, zbl = {0584.20046}, url = {http://geodesic.mathdoc.fr/item/SF_1986__33_134818/} }
F. Otto. On two problems related to cancellativity.. Semigroup forum, Tome 33 (1986), pp. 331-356. http://geodesic.mathdoc.fr/item/SF_1986__33_134818/