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@article{SF_1974__8_134025, author = {James A. Anderson}, title = {The tensor product of a semigroup with a union of groups.}, journal = {Semigroup forum}, pages = {65--68}, publisher = {mathdoc}, volume = {8}, year = {1974}, zbl = {0275.20111}, url = {http://geodesic.mathdoc.fr/item/SF_1974__8_134025/} }
James A. Anderson. The tensor product of a semigroup with a union of groups.. Semigroup forum, Tome 8 (1974), pp. 65-68. http://geodesic.mathdoc.fr/item/SF_1974__8_134025/