In the last few years the idea of … The restriction of finiteness appears to give a … [than the infinite tape of a Turing machine]. … Many equivalent forms … have been published. One of the first of … [Bul. Math. Biophys., 1943]. … We have been particularly influenced, however, by the … [Automata Studies, 1956] who proved an important theorem characterizing the possible action of …
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