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Robertson, S.E.: Some recent theories and models in information retrieval (1980)
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Robertson, S.E.: Theories and models in information retrieval (1977)
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Robertson, S.E.: On term selection for query expansion (1990)
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Robertson, S.E.: On relevance weight estimation and query expansion (1986)
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Robertson, S.E.: Indexing theory and retrieval effectiveness (1979)
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Nielsen, B.: Smartcom for Windows : a review (1993)
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Hyman, M.: Headfast (1993)
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Warner, J.: Retrieval performance tests in relation to online bibliographic searching (1992)
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Dow Jones releases Windows version of Dow Jones Interactive (1998)
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Buckland, M.: Prototyping enhanced online search capability (1993)
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