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A preliminary version of this work appeared in theProceedings of the ACM Symposium on the Theory of Computing, Marina del Rey, California, May 1969.
Some of these results were obtained in the author's doctoral dissertation, supported by USAF Contract F 44 620—68—C—0030.
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Rounds, W.C. Mappings and grammars on trees. Math. Systems Theory 4, 257–287 (1970). https://doi.org/10.1007/BF01695769
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DOI: https://doi.org/10.1007/BF01695769