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MR1852086 03D30 (03D25 03D45)
Cholak, Peter; Coles, Richard; Downey, Rod; Herrmann, Eberhard Automorphisms of the lattice of $\Pi^0_1$ classes: perfect thin classes and anc degrees. Trans. Amer. Math. Soc. 353 (2001), no. 12, 4899–4924.
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