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Gödel, K. Über formal unentscheidbare Sätze der Principia Mathematica und verwandter Systeme I. Mh Math 149, 1–29 (2006). https://doi.org/10.1007/s00605-006-0423-7
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DOI: https://doi.org/10.1007/s00605-006-0423-7