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Zhang, Hai Yan; Liu, Xue Jun; Ai, Ning; Nie, Yong; Ji, Jian Bing . (2013). Conversion of Glucose to 5-hydroxymethylfurfural with Tetraethylammonium Bromide and Chromium (III) Chloride as Catalysts. Applied Mechanics and Materials, 316-317(), 157–160. doi:10.4028/www.scientific.net/AMM.316-317.157 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research