@article{SF_1994__49_2_135357,
     author = {M.J.J. Branco},
     title = {On the {Pin-Th\'erien} expansion of idempotent monoids.},
     journal = {Semigroup forum},
     pages = {329--334},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1994},
     zbl = {0821.20043},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135357/}
}