http://www.xueshufan.com/publication/1645675097
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http://pdf.aminer.org/000/815/892/dlv_a_system_for_declarative_problem_solving.pdf
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http://doc.paperpass.com/patent/arXivcs0003036.html
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http://pdfs.semanticscholar.org/2de3/59dff112fc52943e0ea63641f387feede5cc.pdf
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http://www.researchgate.net/profile/Nicola_Leone/publication/2355656_DLV_-_A_System_for_Declarative_Problem_Solving/links/0fcfd5110ce3b4a4f6000000
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http://core.ac.uk/download/pdf/2417296.pdf
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