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@article{SF_1980__20_134401, author = {J.E. Pin}, title = {Varietes de languages et monoide des parties.}, journal = {Semigroup forum}, pages = {11--48}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0451.20061}, url = {http://geodesic.mathdoc.fr/item/SF_1980__20_134401/} }
J.E. Pin. Varietes de languages et monoide des parties.. Semigroup forum, Tome 20 (1980), pp. 11-48. http://geodesic.mathdoc.fr/item/SF_1980__20_134401/