1. Fixed point maps of βN;Frolík;Bull. Am. Math. Soc.,1968
2. Sums of ultrafilters;Frolík;Bull. Am. Math. Soc.,1967
3. A topological characterization of ordinals: van Dalen and Wattel revisited;Good;Topol. Appl.,2012
4. Countable Toronto spaces;Gruenhage;Fundam. Math.,2000
5. A chain compact space which is not strongly scattered;Rajagopalan;Isr. J. Math.,1976