Sy Chinh, Le, 		Hung, Pham, AND 		Do Hung, Phan.
" 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</em> [Online], Volume 34 Number 3 (24 September 2018)