1. Applications of the proper forcing axiom;Baumgartner,1984
2. The space of ultrafilters on N covered by nowhere dense sets;Balcar;Fund. Math.,1980
3. More on nowhere dense closed P-sets;Balcar;Bull. Pol. Acad. Sci. Math.,1980
4. Discretely weak P-sets;Dow;Topology Appl.,2009
5. Some linked subsets of posets;Dow;Israel J. Math.,1987