R. Bull and K. Segerberg (1984): Basic Modal Logic

Title:	Basic Modal Logic
Author(s):	R. Bull and K. Segerberg
Year:	1984
Editor(s):	D. Gabbay and F. Guenthner
Volume:	II
Chapter:	II.1
Pages:	1-88
Publisher:	D. Reidel Publishing Company

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