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S. Bodoardo; J. Brenet; M. Maja; P. Spinelli. (1994). Electrochemical behaviour of MnO2 electrodes in sulphuric acid solutions. , 39(13), 1999–2004. doi:10.1016/0013-4686(94)85080-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research