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Kabra, Satish K.; Turpeinen, Esa; Huuhtanen, Mika; Keiski, Riitta L.; Yadav, Ganapati D. . (2015). Direct synthesis of formic acid from carbon dioxide and hydrogen: A thermodynamic and experimental study using poly-urea encapsulated catalysts. Chemical Engineering Journal, (), S1385894715013728–. doi:10.1016/j.cej.2015.09.101 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research