Modality and Description. Smullyan, A. Journal of Symbolic Logic, 13:31–37, 1948.
bibtex   
@article{smull48,
	Author = {Smullyan, A.},
	Journal = {Journal of Symbolic Logic},
	Pages = {31--37},
	Title = {Modality and Description},
	Volume = {13},
	Year = {1948}}

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