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Ullrich, Philip M.; Lutgendorf, Susan K.; Stapleton, Jack T. . (2002). Social Constraints and Depression in HIV Infection: Effects of Sexual Orientation and Area of Residence. Journal of Social and Clinical Psychology, 21(1), 46–66. doi:10.1521/jscp.21.1.46.22402 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research