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  1. Claassen, W.; Cornelius, P.; Ehrmann, D.; Tanghe, P.: Fachwissen Online-Recherche : Suchstrategien in Online-Datenbanken (1988) 10.60 
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    Ehrmann, D.
  2. Ehrmann, D.: Technikinformationen : Suchstrategien für Textdatenbanken (1988) 10.60 
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