Bibliography:Denseness
From Knowino
- Wolfgang Franz (1967). General Topology. Harrap, 43.
- J.L. Kelley (1955). General topology. van Nostrand, 49.
- Lynn Arthur Steen; J. Arthur Seebach jr (1978). Counterexamples in Topology. Berlin, New York: Springer-Verlag, 7. ISBN 0-387-90312-7.
