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@article{SF_1980__19_134377, author = {H.J. Shyr and D.C. Chu}, title = {Monoids of languages admitting ring structures.}, journal = {Semigroup forum}, pages = {127--132}, publisher = {mathdoc}, volume = {19}, year = {1980}, zbl = {0435.20045}, url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134377/} }
H.J. Shyr; D.C. Chu. Monoids of languages admitting ring structures.. Semigroup forum, Tome 19 (1980), pp. 127-132. http://geodesic.mathdoc.fr/item/SF_1980__19_134377/