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Dittmar, Helga; Bond, Rod; Hurst, Megan; Kasser, Tim . (2014). The relationship between materialism and personal well-being: A meta-analysis.. Journal of Personality and Social Psychology, 107(5), 879–924. doi:10.1037/a0037409 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research