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  1.  3
    A semantic backward chaining proof system.Xumin Nie & David A. Plaisted - 1992 - Artificial Intelligence 55 (1):109-128.
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    Non-Horn clause logic programming.Xumin Nie - 1997 - Artificial Intelligence 92 (1-2):243-258.
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    Refinements to depth-first iterative-deepening search in automatic theorem proving.Xumin Nie & David A. Plaisted - 1989 - Artificial Intelligence 41 (2):223-235.
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