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  • × year_i:[2010 TO 2020}
  1. Ratzek, W.: ¬Das Problem mit den Problemen : mögliche Auswege aus dem Dilemma (2013) 8.57
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    Author
    Ratzek, W.
  2. Ratzek, W.: Problemlösung. Verifiziertes Faktum oder Illusion? (2013) 8.57
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    Author
    Ratzek, W.