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Cerón, I.X.; Ng, R.T.L.; El-Halwagi, M.; Cardona, C.A. . (2014). Process synthesis for antioxidant polyphenolic compounds production from Matisia cordata Bonpl. (zapote) pulp. Journal of Food Engineering, 134(), 5–15. doi:10.1016/j.jfoodeng.2014.02.010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research