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Robert D. Putnam. (2007). E Pluribus Unum: Diversity and Community in the Twenty-first Century The 2006 Johan Skytte Prize Lecture. , 30(2), 137–174. doi:10.1111/j.1467-9477.2007.00176.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research