1. Asahi Shimbun (2011): An ephemeral lake appeared for the first time in seven years. Asahi Shimbun, Morning edition, 6 October, 2011.*
2. Casciotti, K.L., Sigman, D.M., Hastings, M.G., Böhlke, J.K. and Hilkert, A. (2002): Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method. Analytical Chemistry, 74, 4905-4921.
3. Craig, H. (1961): Isotopic variations in meteoric waters. Science, 133, 1702-1703.
4. Hamada, H., Katsumata, D. and Oyagi, H. (2012): Investigation of seasonal change of water temperature and water quality and water balance on Lake Motosu-ko. Bulletin of the Faculty of Education, Chiba University, 60, 459-468.
5. Hamano, K. (1976): Groundwater in the northern foot of Mt. Fuji. Memoirs of the Faculty of Education & Human Science Yamanashi University, 27, 59-66.*