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@article{SF_1991__43_3_135106, author = {C.P. Rupert}, title = {On commutative {Kleene} monoids.}, journal = {Semigroup forum}, pages = {163--177}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1991}, zbl = {0762.68048}, url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135106/} }
C.P. Rupert. On commutative Kleene monoids.. Semigroup forum, Tome 43 (1991) no. 3, pp. 163-177. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135106/