@article{SF_1982__24_134556,
     author = {J. Day},
     title = {Compact semilattice quotients which separate idempotent {J-classes.}},
     journal = {Semigroup forum},
     pages = {341--360},
     year = {1982},
     volume = {24},
     zbl = {0487.22001},
     url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134556/}
}