@article{05174690, title = {On the definition of a Lachlan semilattice.}, journal = {Sibirskij Matematicheskij Zhurnal}, volume = {47}, year = {2006}, pages = {383-393}, zbl = {1115.06003}, language = {en}, url = {http://dml.mathdoc.fr/item/05174690} }
Podzorov, S.Yu. On the definition of a Lachlan semilattice.. Sibirskij Matematicheskij Zhurnal, Tome 47 (2006) pp. 383-393. http://gdmltest.u-ga.fr/item/05174690/