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  1. Collins, F.H.; Robertson, M.: ¬The making of an index (1993) 9.87
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  2. Robertson, M.: Sir Edward Cooks' 'Art of indexing' (1918) (1994) 9.87
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  3. Robertson, M.: Foreign concepts : indexing and indexes on the continent (1995) 9.87
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  4. Robertson, M.; Willett, P.: ¬An upperbound to the performance of ranked output searching : optimal weighting of query terms using a genetic algorithms (1996) 9.87
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  5. Diepeveen, C.; Fassbender, J.; Robertson, M.: Indexing software (2007) 9.87
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