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Veluchamy, C., & Kalamdhad, A. S. (2017). Influence of pretreatment techniques on anaerobic digestion of pulp and paper mill sludge: A review. Bioresource Technology, 245, 1206–1219. doi:10.1016/j.biortech.2017.08.179 
10.1016/j.biortech.2017.08.179