@article{SF_1984__28_134640,
     author = {J.E. Pin},
     title = {On semidirect products of two finite semilattices.},
     journal = {Semigroup forum},
     pages = {73--82},
     year = {1984},
     volume = {28},
     zbl = {0527.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__28_134640/}
}