On recursion in ETOL systems
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摘要
The class of ETOL systems is investigated from a structural point of view. The effect of several kinds of recursiveness of symbols is studied and some structural characterizations of known subclasses of LETOL are established.
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论文评审过程：Received 15 June 1977, Revised 11 September 1978, Available online 2 December 2003.
论文官网地址：https://doi.org/10.1016/0022-0000(79)90027-8
