%0 Journal Article %A Koppelberg, Sabine %A Shelah, Saharon %T Densities of Ultraproducts of Boolean Algebras %J Canadian journal of mathematics %D 1995 %P 132-145 %V 47 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1995-007-0/ %R 10.4153/CJM-1995-007-0 %F 10_4153_CJM_1995_007_0