1. American Public Health Association, American Water Works Association and Water Environment Federation (1998). Standard Methods for the Examination of Water and Wastewater, 20th edn, American Publich Health Association, Washington DC, USA.
2. Determinations of Humic Substances and Other Dissolved Organic Matter and Their Effects on the Increase of COD in Lake Biwa
3. Gurung T. B. and Urabe J. (1999). Temporal and vertical difference in factors limiting growth rate of heterotrophic bacteria in Lake Biwa, Microbial Ecol., 38, 136-145.
4. Hayakawa K. (2005). Behavior of organic matter in Lake Biwa, Annual Rep. Lake Biwa Res. Inst., 22, 161-170. (in Japanese)
5. Hayakawa K. and Takahashi M. (2002). Behavior of dissolved organic matter in the northern basin of Lake Biwa and current situation related to COD increase, Annual Rep. Lake Biwa Res. Inst., 19, 42-49. (in Japanese)