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Christensen, J. P. R.: On some properties of Effros Borel structure on spaces of closed subsets. Math. Ann.195 (1) 17–23 (1971).
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Christensen, J.P.R. Necessary and sufficient conditions for the measurability of certain sets of closed subsets. Math. Ann. 200, 189–193 (1973). https://doi.org/10.1007/BF01425230
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DOI: https://doi.org/10.1007/BF01425230