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@article{PORMA_1992__49_3_115793, author = {Almeida, Jorge}, title = {On the power semigroup of a finite semigroup}, journal = {Portugaliae mathematica}, pages = {295--331}, publisher = {mathdoc}, volume = {49}, number = {3}, year = {1992}, mrnumber = {1201293}, zbl = {0773.20026}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1992__49_3_115793/} }
Almeida, Jorge. On the power semigroup of a finite semigroup. Portugaliae mathematica, Tome 49 (1992) no. 3, pp. 295-331. http://geodesic.mathdoc.fr/item/PORMA_1992__49_3_115793/