Nuengjamnong, Chackrit, and Pichaya Rachdawong. 2016. “Performance analysis of the combined plug-flow anaerobic digester (PFAD) and upflow anaerobic sludge blanket (UASB) for treating swine wastewater in Thailand”. The Thai Journal of Veterinary Medicine 46 (3):435-42. https://he01.tci-thaijo.org/index.php/tjvm/article/view/69531.