1. Polish group actions;Becker;J. Amer. Math. Soc.,1998
2. H. Becker, Polish group actions and generalized model theory, in preparation.
3. The Descriptive Set Theory of Polish Group Actions;Becker,1996
4. Transformation groups and C*-algebras;Effros;Ann. Math.,1965
5. Countable models of set theories;Friedman,1973