Y. Ogawa

Dynamics of dissolved oxygen in a hypereutrophic lake: Lake Kasumigaura, Japan

S. Ichimura, H. Seki, K. Kuroiwa, 1979 .

Heavy metals contamination in water and sediments of an urban river in a developing country

H. M. Zakir, N. Shikazono, Y. Ogawa, 2011 .

Determination of the abundance of delta15N in nitrate ion in contaminated groundwater samples using an elemental analyzer coupled to a mass spectrometer.

M. Nishikawa, T. Hirata, H. Ii, 2001, The Analyst.

Behavior of soil nitrogen and leaching of metal elements from arable land

M. Nishikawa, T. Hirata, H. Ii, 2005 .