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Zhou, Yan; Dyck, Jeffrey; Graham, Todd W.; Luo, Huimin; Leonard, Donovan N.; Qu, Jun . (2014). Ionic Liquids Composed of Phosphonium Cations and Organophosphate, Carboxylate, and Sulfonate Anions as Lubricant Antiwear Additives. Langmuir, 30(44), 13301–13311. doi:10.1021/la5032366 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research