@article{SF_1980__21_134453,
     author = {J.A. Anderson and T. Head},
     title = {On injective and flat commutative regular semigroups.},
     journal = {Semigroup forum},
     pages = {283--284},
     publisher = {mathdoc},
     volume = {21},
     year = {1980},
     zbl = {0451.20053},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__21_134453/}
}