Answers to modal and hypothetical questions in knowledge base systems

1992 ◽  
Vol 2 (4) ◽  
pp. 353-367 ◽  
Author(s):  
Nadim Obeid
2007 ◽  
Vol 19 (2) ◽  
pp. 297-309 ◽  
Author(s):  
Yuanbo Guo ◽  
Abir Qasem ◽  
Zhengxiang Pan ◽  
Jeff Heflin

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