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  1. Schuegraf, E.J.: ¬A survey of expert systems in library and information science (1990) 10.60 
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    Schuegraf, E.J.
  2. Schuegraf, E.J.; Bommel, M.F.van: ¬An automatic document indexing system based on cooperating expert systems : design and development (1993) 10.60 
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