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@article{SF_1991__43_3_135119, author = {K.E. Osondu}, title = {Universal groups on semilattices of reversible cancellative semigroups .}, journal = {Semigroup forum}, pages = {331--336}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1991}, zbl = {0738.20057}, url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135119/} }
K.E. Osondu. Universal groups on semilattices of reversible cancellative semigroups .. Semigroup forum, Tome 43 (1991) no. 3, pp. 331-336. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135119/