Neighbourhood system (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Neighbourhood system" in English language version.

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archive.org

Willard, Stephen (1970). General Topology. Addison-Wesley Publishing. ISBN 9780201087079. (See Chapter 2, Section 4)

books.google.com

Willard 2004, pp. 31–37. Willard, Stephen (2004) [1970]. General Topology. Mineola, N.Y.: Dover Publications. ISBN 978-0-486-43479-7. OCLC 115240.

doku.pub

Bourbaki 1989, pp. 17–21. Bourbaki, Nicolas (1989) [1966]. General Topology: Chapters 1–4 [Topologie Générale]. Éléments de mathématique. Berlin New York: Springer Science & Business Media. ISBN 978-3-540-64241-1. OCLC 18588129.

worldcat.org

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Bourbaki 1989, pp. 17–21. Bourbaki, Nicolas (1989) [1966]. General Topology: Chapters 1–4 [Topologie Générale]. Éléments de mathématique. Berlin New York: Springer Science & Business Media. ISBN 978-3-540-64241-1. OCLC 18588129.
Willard 2004, pp. 31–37. Willard, Stephen (2004) [1970]. General Topology. Mineola, N.Y.: Dover Publications. ISBN 978-0-486-43479-7. OCLC 115240.