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Counter-free automata. With an appendix by William Henneman. (English) Zbl 0232.94024
Research Monograph No. 65. Cambridge, Massachusetts, and London, England: The M. I. T. Press. XIX, 163 p. $ 12.50 (1971).

68Q45 Formal languages and automata
68-02 Research exposition (monographs, survey articles) pertaining to computer science
68Q70 Algebraic theory of languages and automata