Yodthongdee, Supawadee, Panomchai Weerayutsil, and Kulyakorn Khuanmar. 2018. “Methane Production in Batch Anaerobic Digestion of Livestock Manures With Different Substrate Concentrations”. International Journal of Engineering & Technology 7 (4.38): 1380-83. https://doi.org/10.14419/ijet.v7i4.38.27879.