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MathSciNet bibliographic data
MR2470843 03E55 (03E40)
Hamkins, Joel David; Johnstone, Thomas A. The proper and semi-proper forcing axioms for forcing notions that preserve $\aleph_2$ or $\aleph_3$. Proc. Amer. Math. Soc. 137 (2009), no. 5, 1823–1833.
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