閉無界集 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "閉無界集" in Chinese language version.

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Jech, Thomas. Set Theory: The Third Millennium Edition, Revised and Expanded [集合論：第三千紀版，經修訂及擴展]. Springer. 2003. ISBN 3-540-44085-2 （英语）.