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Mehmet Rıza Altıokka; Alime Çıtak. (2003). Kinetics study of esterification of acetic acid with isobutanol in the presence of amberlite catalyst. , 239(1-2), 141–148. doi:10.1016/s0926-860x(02)00381-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research