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  1. Koopman, R.: ¬The Pica Micro OPC (1995) 10.07
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    Author
    Koopman, R.
  2. Koopman, R.: ¬Ein OPAC mit Gewichtungsalgorithmen : Der PICA Micro OPC (1996) 10.07
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  3. Wang, S.; Koopman, R.: Second life for authority records (2015) 10.07
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  4. Wang, S.; Koopman, R.: Embed first, then predict (2019) 10.07
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