William B. Easton. Powers of regular cardinals. Annals of mathematical logic, vol. 1 no. 2 (1970), pp. 139–178. - J. R. Shoenfield. Unramified forcing. Axiomatic set theory, Proceedings of symposia in pure mathematics, vol. 13 part 1, American Mathematical Society, Providence, Rhode Island, 1971, pp. 357–381.
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1928 ◽
Vol 8
(1)
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pp. 79-80