MathSciNet bibliographic data MR2021268 (2004k:03079) 03D25 Cenzer, Douglas; Nies, André Global properties of the lattice of \$\Pi\sp 0\sb 1\$$\Pi\sp 0\sb 1$ classes. Proc. Amer. Math. Soc. 132 (2004), no. 1, 239–249 (electronic). Article

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