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  1. Two variants of the system of entailment.Imre Ruzsa - 1975 - Mathematical Logic Quarterly 21 (1):57-68.
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  • Przegląd twierdzeń o dedukcji dla rachunków zdań.Witold A. Pogorzelski - 1964 - Studia Logica 15 (1):163-178.
  • The pure calculus of entailment.Alan Ross Anderson & Nuel D. Belnap - 1962 - Journal of Symbolic Logic 27 (1):19-52.
  • Tautological entailments.Alan Ross Anderson & Nuel D. Belnap - 1962 - Philosophical Studies 13 (1-2):9 - 24.