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https://www.ipss.go.jp/publication/e/jinkomon/pdf/15441103.pdf
http://www.albany.edu/aging/sna/resources/BasicsofConductingFocusGroups.pdf
Focus Groups in UX Research: Article by Jakob Nielsen
Social Research Update 19: Focus Groups
http://www.mnav.com/bensurf.htm
Focus groups: Is consumer research losing its focus?
Cost of Running a Focus Group: Article by Jakob Nielsen
http://www.groupsplus.com/pages/mn091498.htm
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