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* [http://plato.stanford.edu/entries/square/ Stanford Encyclopedia of Philosophy article]

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* [http://uk.geocities.com/frege@btinternet.com/opposition/opposition.htm Square of Opposition] page at the Logic Museum

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* [http://uk.geocities.com/frege@btinternet.com/cantor/Eximport.htm History of the Problem of Existential Import]

* [http://www.square-of-opposition.org/ International Congress on the Square of Opposition]

[[Category:Logic]]

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Square of opposition (view source)