@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/