Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1982__24_134558, author = {H. Cohen and R.J- Koch}, title = {Idempotent semigroups generated by threads {II.}}, journal = {Semigroup forum}, pages = {373--384}, publisher = {mathdoc}, volume = {24}, year = {1982}, zbl = {0504.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134558/} }
H. Cohen; R.J- Koch. Idempotent semigroups generated by threads II.. Semigroup forum, Tome 24 (1982), pp. 373-384. http://geodesic.mathdoc.fr/item/SF_1982__24_134558/