@article{GDZPPN001256971, title = {Flatness and amalgamation in semigroups.}, journal = {Semigroup forum}, volume = {30}, year = {1984}, pages = {337-342}, zbl = {0542.20041}, url = {http://dml.mathdoc.fr/item/GDZPPN001256971} }
Bulman-Fleming, S.; McDowell, K. Flatness and amalgamation in semigroups.. Semigroup forum, Tome 30 (1984) pp. 337-342. http://gdmltest.u-ga.fr/item/GDZPPN001256971/