@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/