A. W. Burks and J. B. Wright. Sequence generators and digital computers. Recursive function theory, Proceedings of symposia in pure mathematics, vol. 5, American Mathematical Society, Providence 1962, pp. 139–199. - Arthur W. Burks and Jesse B. Wright. Sequence generators, graphs, and formal languages. Information and control, vol. 5 (1962), pp. 204–212.
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