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Paul R. Vowell; David C. May. (2000). Another Look at Classic Strain Theory: Poverty Status, Perceived Blocked Opportunity, and Gang Membership as Predictors of Adolescent Violent Behavior. , 70(1), 42–60. doi:10.1111/j.1475-682x.2000.tb00895.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research