Title: Self-Reference and Modal Logic, Author: Craig Smorynski
Title: The Worlds of Possibility: Modal Realism and the Semantics of Modal Logic, Author: Charles S. Chihara
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Title: Possibilities and Paradox: An Introduction to Modal and Many-Valued Logic / Edition 1, Author: J. C. Beall
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Title: Modal Logic: An Introduction to its Syntax and Semantics, Author: Max A. Freund