Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1982__25_134589, author = {R.J. Koch and J.A. Hildebrant}, title = {A note on idempotents.}, journal = {Semigroup forum}, pages = {386--386}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0508.22007}, url = {http://geodesic.mathdoc.fr/item/SF_1982__25_134589/} }
R.J. Koch; J.A. Hildebrant. A note on idempotents.. Semigroup forum, Tome 25 (1982), p. 386. http://geodesic.mathdoc.fr/item/SF_1982__25_134589/