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Sunkyu Park; John O Baker; Michael E Himmel; Philip A Parilla; David K Johnson. (2010). Cellulose crystallinity index: measurement techniques and their impact on interpreting cellulase performance. , 3(1), 10–0. doi:10.1186/1754-6834-3-10 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research