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"The global properties of valid formulas in modal logic K."
Jigui Sun, Xiaochun Cheng, Xuhua Liu (1996)
- Jigui Sun, Xiaochun Cheng
, Xuhua Liu:
The global properties of valid formulas in modal logic K. J. Comput. Sci. Technol. 11(6): 615-621 (1996)

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