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Klein, S.T.: On the use of negation in Boolean IR queries. (2009)
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Young, C.W.; Eastman, C.M.; Oakman, R.L.: ¬An analysis of ill-formed input in natural language queries to document retrieval systems (1991)
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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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Lucas, W.; Topi, H.: Form and function : the impact of query term and operator usage on Web search results (2002)
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