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  1. Tenopir, C.; Ennis, L.: ¬The digital reference work of academic libraries (1998) 0.02 
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    Source
    Online. 22(1998) no.4, S.22-28
  2. Buchner, M.: ¬Die Machete im Dschungel : Persönliche Auskunftsdienste: "Hier werden Sie geholfen" - Ratgeber sind die neue Konkurrenz für Internet-Suchmaschinen (2001) 0.00 
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