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Nakkouzi, Z.S.; Eastman, C.M.: Query formulation for handling negation in information retrieval systems (1990)
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McQuire, A.R.; Eastman, C.M.: ¬The ambiguity of negation in natural language queries to information retrieval systems (1998)
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Klein, S.T.: Processing queries with metrical constraints in XML-based IR systems (2008)
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Kim, Y.W.; Kim, J.H.: ¬A model of knowledge based information retrieval with hierarchical concept graph (1990)
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Spink, A.; Wolfram, D.; Jansen, B.J.; Saracevic, T.: Searching the Web : the public and their queries (2001)
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