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@article{SF_1995__50_3_135380, author = {D.C. Jackson}, title = {Direct products of cyclic semigroups and unions of groups.}, journal = {Semigroup forum}, pages = {223--232}, publisher = {mathdoc}, volume = {50}, number = {3}, year = {1995}, zbl = {0828.20048}, url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135380/} }
D.C. Jackson. Direct products of cyclic semigroups and unions of groups.. Semigroup forum, Tome 50 (1995) no. 3, pp. 223-232. http://geodesic.mathdoc.fr/item/SF_1995__50_3_135380/