The effects of microorganism on coffee pulp pretreatment as a source of biogas productionSri Rachmania Juliastuti, Tri Widjaja, Ali Altway, Vivi Alvionita Sari, Dessy Arista and Toto IswantoMATEC Web Conf., 156 (2018) 03010DOI: https://doi.org/10.1051/matecconf/201815603010