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Moeslinger, T; Brunner, M; Volf, I; Spieckermann, P G . (1995). Spectrophotometric determination of ascorbic acid and dehydroascorbic acid. Clinical Chemistry, 41(8), 1177–1181. doi:10.1093/clinchem/41.8.1177 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research