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Fife, E.D.; Husch, L.: ¬The Mathematics Archives : making mathematics easy to find on the Web (1999)
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Vaughan, L.; Thelwall, M.: Search engine coverage bias : evidence and possible causes (2004)
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Zuccala, A.; Thelwall, M.; Oppenheim, C.; Dhiensa, R.: Web intelligence analyses of digital libraries : a case study of the National electronic Library for Health (NeLH) (2007)
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Venditto, G.: Search engine showdown : IW Labs tests seven Internet search tools (1996)
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Barjak, F.; Thelwall, M.: ¬A statistical analysis of the web presences of European life sciences research teams (2008)
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