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Chuan Yang; Zhan Yuin Ong; Yi-Yan Yang; Pui Lai Rachel Ee; James L. Hedrick. (2011). Novel Biodegradable Block Copolymers of Poly(ethylene glycol) (PEG) and Cationic Polycarbonate: Effects of PEG Configuration on Gene Delivery. , 32(22), 1826–1833. doi:10.1002/marc.201100350 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research