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"A consecutive calculus for positive relevant implication with necessity."
Nuel D. Belnap Jr., Anil Gupta, J. Michael Dunn (1980)
- Nuel D. Belnap Jr., Anil Gupta, J. Michael Dunn:
A consecutive calculus for positive relevant implication with necessity. J. Philos. Log. 9(4): 343-362 (1980)
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