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@article{SF_1980__19_134386, author = {S. Bulman-Fleming and K. McDowell}, title = {Flatness and projectivity in commutative regular semigroups.}, journal = {Semigroup forum}, pages = {247--260}, publisher = {mathdoc}, volume = {19}, year = {1980}, zbl = {0431.20055}, url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134386/} }
S. Bulman-Fleming; K. McDowell. Flatness and projectivity in commutative regular semigroups.. Semigroup forum, Tome 19 (1980), pp. 247-260. http://geodesic.mathdoc.fr/item/SF_1980__19_134386/