WASET
    Puntipar Sonthiphand and  Tawan Limpiyakorn,  Communities of Ammonia-oxidizing Archaea and Bacteria in Enriched Nitrifying Activated Sludge.   journal   = {International Journal of Bioengineering and Life Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2010, vol. 40(4). 203 - 206
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/12107.