Michael A. Jahn Sigma5-Completeness of Index Sets Arising from the Lattice of Recursively Enumerable Sets. [Citation Graph (0, 0)][DBLP] Ann. Pure Appl. Logic, 1996, v:80, n:1, pp:55-67 [Journal]
Philip D. Welch Determinacy in the Difference Hierarchy of Co-Analytic Sets. [Citation Graph (0, 0)][DBLP] Ann. Pure Appl. Logic, 1996, v:80, n:1, pp:69-108 [Journal]
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