Jingming Wu and  Junqi Yue and  Ruikang Hu and  Zhaoguang Yang and  Lifeng Zhang,  Use of Caffeine and Human Pharmaceutical Compounds to Identify Sewage Contamination.   journal   = {International Journal of Biomedical and Biological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2008, vol. 20(8). 289 - 293
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/8464.