1. B. Balcar and F. Franek, Universal minimal dynamical systems for discrete semigroups, Unpublished.
2. Independent families in complete boolean algebras;Balcar;Trans. Amer. Math. Soc.,1982
3. To distinguish topologically the spaces m∗;Balcar;Bull. Acad. Polon. Sci. Ser. Sci. Math. Astron. Phys.,1978
4. Refinement properties and extensions of filters in Boolean algebras;Balcar;Trans. Amer. Math. Soc.,1981
5. The Theory of Ultrafilters;Comfort,1974