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MR879489 03E35 (03E05)
Blass, Andreas; Shelah, Saharon There may be simple $P_{\aleph_1}$- and $P_{\aleph_2}$-points and the Rudin-Keisler ordering may be downward directed. Ann. Pure Appl. Logic 33 (1987), no. 3, 213–243.
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