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  • × author_ss:"Koopman, R."
  1. Koopman, R.: ¬Ein OPAC mit Gewichtungsalgorithmen : Der PICA Micro OPC (1996) 0.01 
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  2. Koopman, R.: ¬The Pica Micro OPC (1995) 0.01 
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  3. Wang, S.; Koopman, R.: Embed first, then predict (2019) 0.01 
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  4. Wang, S.; Koopman, R.: Second life for authority records (2015) 0.00 
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