WASET
    Sakura Yoshii and  Masakazu Abe and  Akihiro Iijima,  Current Status of Nitrogen Saturation in the Upper Reaches of the Kanna River, Japan.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2013, vol. 84(12). 888 - 892
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/9996835.