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R.K Gilpin; M.E Gangoda. (1969). Effect of solvent viscosity and polarity on reversed-phase chromatographic surfaces. 13C spin-lattice relaxation of labeled immobilized alkyl ligands. , 64(3), 408–413. doi:10.1016/0022-2364(85)90102-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research