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Cai, Lu; Krafft, Thomas; Chen, Tong-Bin; Gao, Ding; Wang, Li . (2016). Structure modification and extracellular polymeric substances conversion during sewage sludge biodrying process. Bioresource Technology, 216(), 414–421. doi:10.1016/j.biortech.2016.05.102 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research