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@article{SF_1981__23_134517, author = {H. Cohen and R.J. Koch}, title = {Idempotent semigroups generated by threads, {I.}}, journal = {Semigroup forum}, pages = {247--254}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0533.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134517/} }
H. Cohen; R.J. Koch. Idempotent semigroups generated by threads, I.. Semigroup forum, Tome 23 (1981), pp. 247-254. http://geodesic.mathdoc.fr/item/SF_1981__23_134517/