%0 Journal Article %A Arthur W. Apter %T Singular Failures of GCH and Level by Level Equivalence %J Bulletin of the Polish Academy of Sciences. Mathematics %D 2014 %P 11-21 %V 62 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ba62-1-2/ %R 10.4064/ba62-1-2 %G en %F 10_4064_ba62_1_2