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Marvin L. Minsky, Recursive Unsolvability of Post's Problem of "Tag" and other Topics in Theory of Turing Machines, Annals of Mathematics, Vol. 74, No. 3 (Nov., 1961), pp. 437-455 ...
Stephan Wehner, Enumerations, Countable Structures and Turing Degrees, Proceedings of the American Mathematical Society, Vol. 126, No. 7 (Jul., 1998), pp. 2131-2139 ...
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