Anjan Shukla. Decision procedures for Lewis system S1 and related modal systems. Notre Dame journal of formal logic, vol. 11 (1970), pp. 141–180.
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1970 ◽
Vol 11
(2)
◽
pp. 141-180
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1996 ◽
Vol 170
(1-2)
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pp. 1-46
◽