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@article{SF_1974__6_133977, author = {G. Thierrin}, title = {The syntactic monoid of a hypercode.}, journal = {Semigroup forum}, pages = {227--231}, publisher = {mathdoc}, volume = {6}, year = {1974}, zbl = {0262.20086}, url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133977/} }
G. Thierrin. The syntactic monoid of a hypercode.. Semigroup forum, Tome 6 (1974), pp. 227-231. http://geodesic.mathdoc.fr/item/SF_1974__6_133977/