1. Resources Council, Science and Technology Agency, Japan, (Report 113) Standard tables of food composition in Japan -Minerals (magnesium, zinc and copper), (Japanese), STA, 1991, pp. 69-77.
2. Deficiency and excess of minerals or trace elements;Nishimuta;Rinsho-Eiyou (Japanese),1996
3. M. Nishimuta, unpublished observation.