1. Coultate, T. P., Food, The Chemistry of its Components, Royal Society of Chemistry, London, 1989.
2. Nutrient Availability: Chemical and Biological Aspects, ed. D. A. T. Southgate, I. T. Johnson and G. R. Fenwick, Royal Society of Chemistry, London, 1989.
3. Trace Elements in Health and Disease, ed. A. Aitio, A. Aro, J. Jarvisalo and H. Varnio. Royal Society of Chemistry, London, 1991.
4. See, Bryce-Smith, D., Chem. Br., 25 (1989) 783 and
5. See, Bryce-Smith, D., 26 (1990) 24 and reply by