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Duan, C.L.; Diao, Z.J.; Zhao, Y.M.; Huang, W. . (2015). Liberation of valuable materials in waste printed circuit boards by high-voltage electrical pulses. Minerals Engineering, 70(), 170–177. doi:10.1016/j.mineng.2014.09.018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research