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Praptiningsih G.A, Roy Hendroko, Satriyo K Wahono, Andi Sasmito, Leopold O. Nelwan, Anggi Nindita, Tony Liwang. "Optimization of Concentration and EM4 Augmentation for Improving Bio-Gas Productivity from Jatropha curcas Linn Capsule Husk." International Journal of Renewable Energy Development 3.1 (2014)