Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1979__18_134357, author = {K. Todorov}, title = {Inverse elements and their average number in a finite symmetric semigroup.}, journal = {Semigroup forum}, pages = {279--281}, publisher = {mathdoc}, volume = {18}, year = {1979}, zbl = {0419.20052}, url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134357/} }
K. Todorov. Inverse elements and their average number in a finite symmetric semigroup.. Semigroup forum, Tome 18 (1979), pp. 279-281. http://geodesic.mathdoc.fr/item/SF_1979__18_134357/