@article{GDZPPN001263048, title = {Retracts and monomorphism monoids in semigroup varieties.}, journal = {Semigroup forum}, volume = {46}, year = {1993}, pages = {373-380}, zbl = {0783.20035}, url = {http://dml.mathdoc.fr/item/GDZPPN001263048} }
Lender, V.B. Retracts and monomorphism monoids in semigroup varieties.. Semigroup forum, Tome 46 (1993) pp. 373-380. http://gdmltest.u-ga.fr/item/GDZPPN001263048/