Hartley RogersJr., Computing degrees of unsolvability. Mathematische Annalen, vol. 138 (1959). pp. 125–140. - Hartley RogersJr., Computing degrees of unsolvability. Summaries of talks presented at the Summer Institute for Symbolic Logic, Cornell University, 1957, 2nd edn., Communications Research Division, Institute for Defense Analyses, Princeton, N.J., 1960, pp. 277–283.
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