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== 참고 문헌 ==
* {{책 인용|저자=김승욱|제목=위상수학: 집합론을 중심으로|출판사=경문사|판=2판|날짜=2004|url=http://www.kyungmoon.com/shop_product/shop_pdt_view.php?p_idx=2604|isbn=89-7282-587-5|언어고리=ko}}
* [[{{책 인용|저자고리=니콜라 부르바키|성=Bourbaki]]; <cite>|이름=Nicolas|제목=Topologie Générale</cite> (<cite>General Topology</cite>); ISBN générale|isbn=0-387-19374-X|언어고리=fr}}
* {{책 인용|이름=John L.|성=Kelley|제목=General Topology|isbn=0-387-90125-6|판=2판|날짜=1975|총서=Graduate Texts in Mathematics|권=27|언어고리=en|출판사=Springer|zbl=0306.54002}}
* {{책 인용|이름=James R.|성=Munkres|제목=Topology|isbn=978-013181629-9|판=2판|출판사=Prentice Hall|날짜=2000|url=http://www.pearsonhighered.com/bookseller/product/Topology/9780131816299.page|zbl=0951.54001|mr=0464128 |언어고리=en}}
* {{책 인용|이름=Paul L.|성=Shick|제목=Topology: Point-Setpoint–set and Geometricgeometric|isbn=0-470-09605-5|언어고리=en}}
* {{책 인용|이름=Ryszard|성=Engelking|제목=General Topologytopology|isbn=3-88538-006-4|언어고리=en}}
* {{Citation책 인용 | last1last=Steen | first1first=Lynn Arthur | author1-link=Lynn Arthur Steen | last2=Seebach | first2=J. Arthur Jr. | author2-link공저자=J. Arthur Seebach, Jr. | title제목=[[Counterexamples in Topology]] | origyear=1978 | publisher=[[Springer-Verlag]] | location=Berlin, New York | edition=[[Dover Publications|Dover]] reprint of 1978 | isbn=978-0-486-68735-3 | id={{MathSciNet|idmr=507446}} | year=1995}}
* {{책 인용|이름=O.Ya. |성=Viro, |공저자=O.A. Ivanov, V.M. Kharlamov and, N.Yu. Netsvetaev; [|url=http://www.ams.org/bookstore-getitem/item=mbk-54 <cite>|제목=Elementary Topology: Textbook in Problems</cite>]; ISBN |isbn=978-0-8218-4506-6|출판사=American Mathematical Society|언어고리=en}}
== 바깥 고리 ==
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