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Al-Shahri, Omar A.; Ismail, Firas B.; Hannan, M.A.; Lip, M.S. Hossain; Al-Shetwi, Ali Q.; Begum, R.A.; Al-Muhsen, Nizar F.O.; Soujeri, Ebrahim . (2020). Solar photovoltaic energy optimization methods, challenges and issues: A comprehensive review. Journal of Cleaner Production, (), 125465–. doi:10.1016/j.jclepro.2020.125465 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research