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Azizullah Azizullah; Muhammad Nasir Khan Khattak; Peter Richter; Donat-Peter Häder. (2011). Water pollution in Pakistan and its impact on public health — A review. , 37(2), 0–497. doi:10.1016/j.envint.2010.10.007 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research