Mamimin, Chonticha, Poonsuk Prasertsan, Prawit Kongjan, and Sompong O-Thong. 2017. “Effects of Volatile Fatty Acids in Biohydrogen Effluent on Biohythane Production from Palm Oil Mill Effluent under Thermophilic Condition”. Electronic Journal of Biotechnology 29 (1). Valparaíso, Chile. https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/2017.07.006.