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  1.  8
    Extensional Gödel functional interpretation.Horst Luckhardt - 1973 - New York,: Springer Verlag.
  2.  10
    A short proof of a well‐known theorem of intuitionistic analysis.Horst Luckhardt - 1975 - Mathematical Logic Quarterly 21 (1):185-186.
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  3. Bounds extracted by Kreisel from ineffective proofs.Horst Luckhardt - 1996 - In Piergiorgio Odifreddi (ed.), Kreiseliana: About and Around Georg Kreisel. A K Peters. pp. 289--300.
     
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