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Varieties of formal languages. (Transl. from the French). (English) Zbl 0655.68095
Oxford: North Oxford Academic. 150 p. (1985).
See the review of the French original (Masson, Paris 1984; Zbl 0636.68093). See also the review of the English translation which appeared at Plenum Publ. Corp. (New York 1986; Zbl 0632.68069).

68Q45 Formal languages and automata
20M35 Semigroups in automata theory, linguistics, etc.
68-02 Research exposition (monographs, survey articles) pertaining to computer science
68Q70 Algebraic theory of languages and automata
20M05 Free semigroups, generators and relations, word problems
20M07 Varieties and pseudovarieties of semigroups