1. Sums of ultrafilters;Frolík;Bull. Am. Math. Soc.,1967
2. Large homogeneous compact spaces;Kunen,1990
3. New properties of topological spaces related to extremal disconnectedness;Groznova;Vestn. Mosk. Univ. Ser. 1. Mat. Mekh.,2023
4. Algebra in the Stone–Čech Compactification;Hindman,1998
5. The Theory of Ultrafilters;Comfort,1974