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P. Claesson; R.G. Horn; R.M. Pashley. (1984). Measurement of surface forces between mica sheets immersed in aqueous quaternary ammonium ion solutions. , 100(1), 250–263. doi:10.1016/0021-9797(84)90433-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research