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Magidor Menachem. Representing sets of ordinals as countable unions of sets in the core model. Transactions of the American Mathematical Society, vol. 317 (1990), pp. 91–126.
Welch, PhilipVolume:
60
Journal:
The Journal of Symbolic Logic
DOI:
10.2307/2275869
Date:
June, 1995
File:
PDF, 449 KB
1995