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Jianfeng Shen; Shuguang Zhu; Xinzhi Liu; Houlei Zhang; Junjie Tan. (2010). The prediction of elemental composition of biomass based on proximate analysis. , 51(5), 983–987. doi:10.1016/j.enconman.2009.11.039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research