1. On the cardinality of dense subsets of linear orderings I;Baumgartner;Notices Am. Math. Soc.,1968
2. Results and independence proofs in combinatorial set theory;Baumgartner,1970
3. Models and Ultraproducts;Bell,1970
4. Ultraproducts and other methods of constructing models;Chang,1967
5. Powers of regular cardinals;Easton;Ann. Math. Logic,1970