1. Ueber nulldimensionale Raume;Banaschewsky;Math. Nachr.,1955
2. Bourbaki, N., Livre III, Ch. 1.
3. Rings of continuous functions in which every finitely generated ideal is principal;Gillman;Transac. Am. Math. Soc.,1956
4. Notes on Boolean algebras;Halmos,1959
5. Compactifications of dimension zero;Heider;Proc. Am. Math. Soc.,1959