References
I. L. Humberstone, ‘Extensionality in Sentence Position’, Journal of Philosophical Logic 15 (1986), 27–54.
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Humberstone, L. The lattice of extensional connectives: A correction. J Philos Logic 17, 221–223 (1988). https://doi.org/10.1007/BF00247953
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DOI: https://doi.org/10.1007/BF00247953