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Chen, Chen; Zhou, Benqing; Zhu, Xiaoyue; Shen, Mingwu; Shi, Xiangyang . (2016). Branched polyethyleneimine modified with hyaluronic acid via a PEG spacer for targeted anticancer drug delivery. RSC Adv., 6(11), 9232–9239. doi:10.1039/C5RA23022E 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research