Joint papers of Farah and Shelah

FaSh:954 2010-11-24 [pdf] [ps] [abstract]: Farah+Shelah, A Dichotomy for the number of ultrapowers -- J Math Logic 10 (2010) 45-81
FaSh:987 2011-11-29 [pdf] [ps] [abstract]: Farah+Shelah, Trivial automorphisms