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  1. Arithmetical necessity, provability and intuitionistic logic.Rob Goldblatt - 1978 - Theoria 44 (1):38-46.
  • One hundred and two problems in mathematical logic.Harvey Friedman - 1975 - Journal of Symbolic Logic 40 (2):113-129.
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  • An essay in classical modal logic.Krister Segerberg - 1971 - Uppsala,: Filosofiska foĢˆreningen och Filosofiska institutionen vid Uppsala universitet.