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  1. Polynomially and superexponentially shorter proofs in fragments of arithmetic.Franco Montagna - 1992 - Journal of Symbolic Logic 57 (3):844-863.
  • European Summer Meeting of the Association for Symbolic Logic (Logic Colloquium'88), Padova, 1988.R. Ferro - 1990 - Journal of Symbolic Logic 55 (1):387-435.