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Robertson, S.E.: Indexing theory and retrieval effectiveness (1979)
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Robertson, S.E.; Belkin, N.J.: Ranking in principle (1978)
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Robertson, S.E.: ¬The probabilistic character of relevance (1977)
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Robertson, S.E.: ¬The probability ranking principle in IR (1977)
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Robertson, S.E.; Walker, S.: Some simple effective approximations to the 2-Poisson molde for probabilisitc weighted retrieval (1979)
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Robertson, S.E.: Theories and models in information retrieval (1977)
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Robertson, S.E.; Sparck Jones, K.: Relevance weighting of search terms (1976)
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