Sy Chinh, L., 		Hung, P., & 		Do Hung, P.
(2018).
 Effect of Reflux Ratio on Piggery Wastewater Treatment Efficiency affer Bigogas Processing of Bio-filtration System Combined with Alternate Aeration.
<em>VNU Journal Of Science: Earth And Environmental Sciences, 34</em>(3).
doi:10.25073/2588-1094/vnuees.4258