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"The n-R.E. Degrees: Undecidability and σ1 Substructures."
Mingzhong Cai, Richard A. Shore, Theodore A. Slaman (2012)
- Mingzhong Cai, Richard A. Shore, Theodore A. Slaman:
The n-R.E. Degrees: Undecidability and σ1 Substructures. J. Math. Log. 12(1): 1250005 (2012)
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