Greg Hjorth and Alexander S. Kechris. Analytic equivalence relations and Ulm-type classifications. The journal of symbolic logic, vol. 60 (1995), pp. 1273–1300. -
Greg Hjorth, Alexander S. Kechris, and Alain Louveau. Borel equivalence relations induced by actions of the symmetric group. Annals of pure and applied logic, vol. 92 (1998), pp. 63–112.
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1998 ◽
Vol 92
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pp. 63-112
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1997 ◽
Vol 10
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pp. 215-242
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