Idempotent semigroups generated by threads, I.
Cohen, H. ; Koch, R.J.
Semigroup forum, Tome 23 (1981), p. 247-254 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1981-01-01
EUDML-ID : urn:eudml:doc:134517 
@article{GDZPPN001255177,
     title = {Idempotent semigroups generated by threads, I.},
     journal = {Semigroup forum},
     volume = {23},
     year = {1981},
     pages = {247-254},
     zbl = {0533.22002},
     url = {http://dml.mathdoc.fr/item/GDZPPN001255177}
}

Cohen, H.; Koch, R.J. Idempotent semigroups generated by threads, I.. Semigroup forum, Tome 23 (1981) pp. 247-254. http://gdmltest.u-ga.fr/item/GDZPPN001255177/