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MR2033315 (2005d:03084) 03D45 (03C15 03C57 03D30 03D55)
Hirschfeldt, Denis R.; White, Walker M. Realizing levels of the hyperarithmetic hierarchy as degree spectra of relations on computable structures. Notre Dame J. Formal Logic 43 (2002), no. 1, 51–64 (2003).
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