@article{GDZPPN001262300,
title = {A characterization of regular monoids by flatness of left acts.},
journal = {Semigroup forum},
volume = {46},
year = {1993},
pages = {85-89},
zbl = {0766.20024},
url = {http://dml.mathdoc.fr/item/GDZPPN001262300}
}
Liu, Z. A characterization of regular monoids by flatness of left acts.. Semigroup forum, Tome 46 (1993) pp. 85-89. http://gdmltest.u-ga.fr/item/GDZPPN001262300/