Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1976__13_134195, author = {S. Ligh}, title = {On a class of semigroups admitting ring structure.}, journal = {Semigroup forum}, pages = {37--46}, publisher = {mathdoc}, volume = {13}, year = {1976}, zbl = {0348.20047}, url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134195/} }
S. Ligh. On a class of semigroups admitting ring structure.. Semigroup forum, Tome 13 (1976), pp. 37-46. http://geodesic.mathdoc.fr/item/SF_1976__13_134195/