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  1. Modal Logic and Classical Logic.R. A. Bull - 1987 - Journal of Symbolic Logic 52 (2):557-558.
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  • Notes on modal definability.Johan van Benthem - 1988 - Notre Dame Journal of Formal Logic 30 (1):20-35.
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  • A finitely axiomatizable undecidable extension of K.Stephen Isard - 1977 - Theoria 43 (3):195-202.
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