%0 Book %1 Hughes1985Introduction %A Hughes, George E. %A Cresswell, Max J. %B University Paperbacks %C London %D 1985 %I Methuen %K 03-01-mathematical-logic-and-foundations-instructional-exposition 03b45-modal-logic-including-the-logic-of-norms %T An Introduction to Modal Logic %U http://www.worldcat.org/isbn/041629460 %@ 041629460

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