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@article{SF_1981__23_134516, author = {W.D. Burgess}, title = {The injective hull of {S-sets,} {S} a semilattice of groups.}, journal = {Semigroup forum}, pages = {241--246}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0479.20035}, url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134516/} }
W.D. Burgess. The injective hull of S-sets, S a semilattice of groups.. Semigroup forum, Tome 23 (1981), pp. 241-246. http://geodesic.mathdoc.fr/item/SF_1981__23_134516/