Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1995__51_1_135396, author = {S. Schwarz}, title = {Powers of subsets in a finite semigroup.}, journal = {Semigroup forum}, pages = {1--22}, publisher = {mathdoc}, volume = {51}, number = {1}, year = {1995}, zbl = {0833.20074}, url = {http://geodesic.mathdoc.fr/item/SF_1995__51_1_135396/} }
S. Schwarz. Powers of subsets in a finite semigroup.. Semigroup forum, Tome 51 (1995) no. 1, pp. 1-22. http://geodesic.mathdoc.fr/item/SF_1995__51_1_135396/