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Formal languages. (English) Zbl 0262.68025

ACM Monograph Series. New York-London: Academic Press. XIII,322 p. $ 19.00 (1973).

MSC:

68Q45 Formal languages and automata
68-02 Research exposition (monographs, survey articles) pertaining to computer science
03D05 Automata and formal grammars in connection with logical questions

Online Encyclopedia of Integer Sequences:

Numbers that contain only 1’s, 2’s and 3’s.