Boundary (topology) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Boundary (topology)" in English language version.

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6^th place

archive.org

Hausdorff, Felix (1914). Grundzüge der Mengenlehre. Leipzig: Veit. p. 214. ISBN 978-0-8284-0061-9. {{cite book}}: ISBN / Date incompatibility (help) Reprinted by Chelsea in 1949.
Hausdorff, Felix (1914). Grundzüge der Mengenlehre. Leipzig: Veit. p. 281. ISBN 978-0-8284-0061-9. {{cite book}}: ISBN / Date incompatibility (help) Reprinted by Chelsea in 1949.