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G.P. Karayannidis; C.P. Roupakias; D.N. Bikiaris; D.S. Achilias. (2003). Study of various catalysts in the synthesis of poly(propylene terephthalate) and mathematical modeling of the esterification reaction. , 44(4), 931–942. doi:10.1016/s0032-3861(02)00875-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research