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Crivello, J. V.; Kim, Whan-Gi . (1994). Synthesis and Photopolymerization of Multifunctional Propenyl Ether Monomers. Journal of Macromolecular Science, Part A, 31(9), 1105–1119. doi:10.1080/10601329409351539 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research