1. Limits in the uniform ultrafilters;Baker;Trans. Am. Math. Soc.,2001
2. Matrices and ultrafilters;Baker,2002
3. Notions of size and combinatorial properties of quotient sets in semigroups;Bergelson;Topol. Proc.,1998
4. P-sets and minimal right ideals in N⁎;Brian;Fundam. Math.,2015
5. Gδ semifilters and ω⁎;Brian;Fundam. Math.,2016