Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1975__11_134144, author = {Jonathan Leech}, title = {The...-CATEGORY {OF} {A} {SEMIGROUP.}}, journal = {Semigroup forum}, pages = {283--296}, publisher = {mathdoc}, volume = {11}, year = {1975}, language = {en}, url = {http://geodesic.mathdoc.fr/item/SF_1975__11_134144/} }
Jonathan Leech. The...-CATEGORY OF A SEMIGROUP.. Semigroup forum, Tome 11 (1975), pp. 283-296. http://geodesic.mathdoc.fr/item/SF_1975__11_134144/