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  1. Yager, R.R.; Rybalov, A.: On the fusion of documents from multiple collection information retrieval systems (1998) 10.31 
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  2. Yager, R.R.: ¬A hierarchical document retrieval language (2000) 10.31 
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  3. Yager, R.R.: Knowledge trees and protoforms in question-answering systems (2006) 10.31 
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