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Eva Elliott; Alison J. Watson; Ursula Harries. (2002). Harnessing expertise: involving peer interviewers in qualitative research with hard-to-reach populations. , 5(2), 172–178. doi:10.1046/j.1369-6513.2002.00158.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research