%0 Journal Article
%A Arthur W. Apter
%T Mixed Levels of Indestructibility
%J Bulletin of the Polish Academy of Sciences. Mathematics
%D 2015
%P 113-122
%V 63
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ba63-2-2/
%R 10.4064/ba63-2-2
%G en
%F 10_4064_ba63_2_2