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  1. Modality and description.Arthur Smullyan - 1948 - Journal of Symbolic Logic 13 (1):31-37.
  • Modality and Description.Arthur Francis Smullyan - 1948 - Journal of Symbolic Logic 13 (3):149-150.
  • Quantifiers and propositional attitudes.Willard van Orman Quine - 1955 - Journal of Philosophy 53 (5):177-187.