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Pawel G. Parzuchowski; Martyna Grabowska; Michal Jaroch; Monika Kusznerczuk. (2009). Synthesis and characterization of hyperbranched polyesters from glycerol-based AB2 monomer. , 47(15), 3860–3868. doi:10.1002/pola.23452 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research