1. An example in density character;Comfort;Arch. Math.,1963
2. Fixed points of maps of βN;Frolík;Bull. Amer. Math. Soc.,1968
3. The non-existence of a certain type of transformation;Harrold;Duke Math. J.,1939
4. A problem of set-theoretic topology;Hewitt;Duke Math. J.,1943
5. On two-to-one continuous functions;Mioduszewski;Dissertationes Math. (Rozprawy Mat.),1961