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 27 April 2024]. Available from: https://publications.waset.org/pdf/9996835.