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@article{SF_1992__44_1_135155, author = {B. Billhardt}, title = {On inverse semigroups the closure of whose set of idempotents is a {Clifford} semigroup.}, journal = {Semigroup forum}, pages = {320--331}, publisher = {mathdoc}, volume = {44}, number = {1}, year = {1992}, zbl = {0747.20032}, url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135155/} }
B. Billhardt. On inverse semigroups the closure of whose set of idempotents is a Clifford semigroup.. Semigroup forum, Tome 44 (1992) no. 1, pp. 320-331. http://geodesic.mathdoc.fr/item/SF_1992__44_1_135155/