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  1.  46
    A note on a proof of Hilbert's second ε-theorem.Pier Luigi Ferrari - 1987 - Journal of Symbolic Logic 52 (1):214-215.
  2.  24
    (1 other version)The Rank Function and Hilbert'S Second ϵ‐Theorem.Pier Luigi Ferrari - 1989 - Mathematical Logic Quarterly 35 (4):367-373.
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