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Jianxian Xue; Charles A. Wilkie. (1995). Swelling-assisted modification of poly(ethylene terephthalate) by methacrylic acid. , 33(7), 1019–1024. doi:10.1002/pola.1995.080330703 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research