Sakura Yoshii and  Kana Sekiguchi and  Akihiro Iijima,  Concentration of Nitrogen in a Forested Headwater Stream in Japan.   journal   = {International Journal of Biological and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2012, vol. 72(12). 772 - 775
    [viewed 18 October 2019]. Available from: https://publications.waset.org/pdf/13984.