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Dag Prawitz, Ha\a a kan Prawitz et Neri Voghera, «A Mechanical Proof Procedure and Its Realization in an Electronic Computer», J. ACM, vol.7, no2, , p.102–128 (ISSN0004-5411, DOI10.1145/321021.321023, lire en ligne, consulté le )
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Alberto Martelli et Ugo Montanari, «An Efficient Unification Algorithm», ACM Trans. Program. Lang. Syst., vol.4, no2, , p.258–282 (ISSN0164-0925, DOI10.1145/357162.357169, lire en ligne, consulté le )
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Dag Prawitz, Ha\a a kan Prawitz et Neri Voghera, «A Mechanical Proof Procedure and Its Realization in an Electronic Computer», J. ACM, vol.7, no2, , p.102–128 (ISSN0004-5411, DOI10.1145/321021.321023, lire en ligne, consulté le )
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