@article{SF_1992__44_1_135141,
     author = {M.S. Putcha and D. Easdown},
     title = {The local semilattice of chains of idempotents.},
     journal = {Semigroup forum},
     pages = {157--163},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0752.06002},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135141/}
}