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Nguyen, Duc; Gadhamshetty, Venkataramana; Nitayavardhana, Saoharit; Khanal, Samir Kumar . (2015). Automatic process control in anaerobic digestion technology: A critical review. Bioresource Technology, 193(), 513–522. doi:10.1016/j.biortech.2015.06.080 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research