Bibliography:Filter (mathematics)
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Revision as of 18:41, 20 January 2011 by Boris Tsirelson (talk | contributions)
- J.L. Kelley (1955). General topology. van Nostrand.
- Lynn Arthur Steen; J. Arthur Seebach jr (1978). Counterexamples in Topology. Berlin, New York: Springer-Verlag. ISBN 0-387-90312-7.