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@article{SF_1972__4_133878, author = {E.E. Devun}, title = {The equivalence of uniquely divisible semigroups and uniquely representable semigroups on the two-cell.}, journal = {Semigroup forum}, pages = {69--72}, publisher = {mathdoc}, volume = {4}, year = {1972}, zbl = {0261.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133878/} }
E.E. Devun. The equivalence of uniquely divisible semigroups and uniquely representable semigroups on the two-cell.. Semigroup forum, Tome 4 (1972), pp. 69-72. http://geodesic.mathdoc.fr/item/SF_1972__4_133878/