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Paul G. Brown; Kiyohisa Fujimori. (1992). Determination of the stereochemistry of maleic anhydride units in copolymers ofp-chlorostyrene with maleic anhydride via13C NMR spectroscopy. , 29(1-2), 85–88. doi:10.1007/bf00558040 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research