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"Countable Initial Segments of the Degrees of Unsolvability."
Alistair H. Lachlan, R. Lebeuf (1976)
- Alistair H. Lachlan, R. Lebeuf:
Countable Initial Segments of the Degrees of Unsolvability. J. Symb. Log. 41(2): 289-300 (1976)
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