MathSciNet bibliographic data MR2452816 03E35 Mitchell, William J. $I[\omega_2]$$I[\omega_2]$ can be the nonstationary ideal on ${\rm Cof}(\omega_1)$${\rm Cof}(\omega_1)$. Trans. Amer. Math. Soc. 361 (2009), no. 2, 561–601. Article

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