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@article{SF_1993__46_1_135214, author = {Z. Liu}, title = {A characterization of regular monoids by flatness of left acts.}, journal = {Semigroup forum}, pages = {85--89}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1993}, zbl = {0766.20024}, url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135214/} }
Z. Liu. A characterization of regular monoids by flatness of left acts.. Semigroup forum, Tome 46 (1993) no. 1, pp. 85-89. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135214/