Hưng, Cao, 		Cam, Bùi, 		Hùng, Trịnh, AND 		Dũng, Bạch.
" Accumulation and transpotation of selected heavy metals in thermophilic anaerobic co-digestion of municipal sewage sludge and organic waste" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 29 Number 1 (15 March 2013)