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^Han, J., & Kamber, M. (2006). Data mining : Concepts and techniques. Elsevier. ISBN9780123814791. {{cite book}}: |access-date= requires |url= (help)CS1 maint: multiple names: authors list (link)
^Webber, B. (2012). "Discourse structure and language technology". Natural Language Engineering. 18 (4): 437–490. doi:10.1017/S1351324911000337. {{cite journal}}: |access-date= requires |url= (help)
