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Langholm, T. (1991). What is a Horn clause in partial logic?. In: van Eijck, J. (eds) Logics in AI. JELIA 1990. Lecture Notes in Computer Science, vol 478. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0018434
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DOI: https://doi.org/10.1007/BFb0018434
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