1. Independent families in complete Boolean algebras;Balcar;Trans. Amer. Math. Soc.,1982
2. Ultrafiters on ω;Baumgartner;J. Symbolic Logic,1995
3. Selective ultrafilters and homogenity;Blass;Ann. Pure Appl. Logic,1988
4. Regular subalgebras of complete Boolean algebras;Błaszczyk;J. Symbolic Logic,2001
5. Cohen algebras and nowhere dense ultrafilters;Błaszczyk;Bull. Polish Acad. Sci.,2001