@article{SF_1993__47_2_135287,
     author = {V.B. Lender},
     title = {Retracts and monomorphism monoids in semigroup varieties.},
     journal = {Semigroup forum},
     pages = {373--380},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1993},
     zbl = {0783.20035},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135287/}
}