对立四边形:修订间差异

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* [http://www.springerlink.com/content/l8rj3631747w/ Special Issue of Logica Universalis Vol2 N1 (2008) on the Square of Opposition]{{Dead link|date=2020年2月 |bot=InternetArchiveBot |fix-attempted=yes }}
* [http://www.springerlink.com/content/l8rj3631747w/ Special Issue of Logica Universalis Vol2 N1 (2008) on the Square of Opposition]{{Dead link|date=2020年2月 |bot=InternetArchiveBot |fix-attempted=yes }}
* [http://plato.stanford.edu/entries/square/ Stanford Encyclopedia of Philosophy article]
* [http://plato.stanford.edu/entries/square/ Stanford Encyclopedia of Philosophy article]
* [https://web.archive.org/web/20060507164846/http://uk.geocities.com/frege%40btinternet.com/cantor/Eximport.htm History of the Problem of Existential Import]
* [http://uk.geocities.com/frege%40btinternet.com/cantor/Eximport.htm History of the Problem of Existential Import]


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