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@article{SF_1990__41_2_135034, author = {S.S. Yu}, title = {Quasi-completely right disjunctive languages.}, journal = {Semigroup forum}, pages = {39--48}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1990}, zbl = {0695.20039}, url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135034/} }
S.S. Yu. Quasi-completely right disjunctive languages.. Semigroup forum, Tome 41 (1990) no. 2, pp. 39-48. http://geodesic.mathdoc.fr/item/SF_1990__41_2_135034/