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  1. Birkenbihl, V.F.: KaGa und Mehrfachdenken : Gehirntraining mit Birkenbihl (2002) 10.60 
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    Birkenbihl, V.F.
  2. Birkenbihl, V.F.: Abruf und Erinnerung : Gehirntraining mit Birkenbihl (2002) 10.60 
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    Birkenbihl, V.F.