Formal Languages.
By Arto Salomaa. (ACM Monograph Series.) Pp. xiii + 322. (Academic (Harcourt Brace Jovanovich): New York and London, May 1973.) $19.
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HAYES, P. Language maths. Nature 247, 319 (1974). https://doi.org/10.1038/247319a0
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DOI: https://doi.org/10.1038/247319a0