@article{GDZPPN001257684, title = {Perfect semilattices.}, journal = {Semigroup forum}, volume = {31}, year = {1985}, pages = {23-30}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN001257684} }
Hansoul, G.; Varlet, J. Perfect semilattices.. Semigroup forum, Tome 31 (1985) pp. 23-30. http://gdmltest.u-ga.fr/item/GDZPPN001257684/