@article{SF_1984__29_134676,
     author = {S. Margolis and J.E. Pin},
     title = {Power monoids and finite {J-trivial} monoids.},
     journal = {Semigroup forum},
     pages = {99--108},
     publisher = {mathdoc},
     volume = {29},
     year = {1984},
     zbl = {0544.20051},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134676/}
}