1. Monotonic normality;Balogh,1991
2. Iterated forcing;Baumgartner,1987
3. Applications of proper forcing;Baumgartner,1984
4. Embedding trees in the rationals;Baumgartner,1970
5. J. Baumgartner and S. Shelah, Remarks on superatomic Boolean algebras, Ann. Pure Appl. Logic 33, 109–130.