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© 1985 Springer-Verlag
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Blass, A. (1985). Kleene degrees of ultrafilters. In: Ebbinghaus, HD., Müller, G.H., Sacks, G.E. (eds) Recursion Theory Week. Lecture Notes in Mathematics, vol 1141. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0076213
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DOI: https://doi.org/10.1007/BFb0076213
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