References
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- Commoner, B., 1970: Threats to the integrity of the nitrogen cycle: nitrogen compounds in soil, water, atmosphere and precipitation. — In: Global Effects of Environmental Pollution, S. F. Singer (ed.): 70–95. D. Redel Pub. Comp., Holland.
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- Ishino, H. & Ogura, N., 1980: Origin of nitrate in surface running water at Tama Hill. — Presented Before 45Th Ann. Meeting Jap. Soc. Limnol.
- Likens, G. E., Bormann, F. H., Johnson, D. W. & Pierce, R. S., 1970: Effects of forest cutting and herbicide treatment on nutrient budgets in the Hubbard Brook watershed-ecosystem. — Ecol. Monogr. 40: 23–47.
- Ogura, N. & Udagawa, T., 1978: Nitrate concentration in shallow ground water at the Aoyagi Terrace. — J. Jap. Water Works Assoc. 529: 23–32 (in Japanese).
- Sakurai, Y., 1975: Pollution of river and ground waters by agricultural wastes. — J. Jap. Soc. Irrig. Drainage Reclamation Eng. 43: 518–524 (in Japanese).
- Yoshida, K. & Ogura, N., 1978: Nitrate concentration in spring water at the Nogawa basin and its possible origin. — Geochem. 12: 44–51 (in Japanese).