@article{GDZPPN001248073,
title = {Projectivity of acts and Morita equivalence of monoids.},
journal = {Semigroup forum},
volume = {2},
year = {1971},
pages = {359-370},
zbl = {0231.18013},
url = {http://dml.mathdoc.fr/item/GDZPPN001248073}
}
Knauer, U. Projectivity of acts and Morita equivalence of monoids.. Semigroup forum, Tome 2 (1971) pp. 359-370. http://gdmltest.u-ga.fr/item/GDZPPN001248073/