Friedrichs, Ferdinand, 		Rudolph3, Karl Ulrich, 		Panning4,, Frank, 		Huyen, Pham, 		Genthe, Wolfgang, AND 		Trung, Do.
" Occurrence of Toxic Substances Inhibiting the Nitrification  in Waste Water from Industrial Zones in Vietnam" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 32 Number 3 (15 September 2016)