1. Abdulla, M., Svensson, S., Nordén, A., & Öckerman, P. A. (1982). The dietary intake of trace elements in Sweden. In J. M. Gawthorne, J. M. Howell, & C. L. White (Eds.), Trace element metabolism in man and animals (pp. 14–17). Berlin: Springer.
2. Alloway, B. J. (2005). Bioavailability of elements in soil. In O. Selinus, B. Alloway, J. A. Centeno, R. B. Finkelman, R. Fuge, U. Lindh, & P. Smedley (Eds.), Essentials of medical geology—impacts of the natural environment on public health (pp. 347–372). London: Elsevier Academic Press.
3. Andersen, P. (2007). A review of micronutrient problems in the cultivated soil of Nepal. Mountain Research and Development, 27, 331–335.
4. Anderson, R. A. (1981). Nutritional role of chromium. Science of the Total Environment, 17, 13–29.
5. Appleton, D. J. (2005). Radon in air and water. In O. Selinus, B. Alloway, J. A. Centeno, R. B. Finkelman, R. Fuge, U. Lindh, & P. Smedley (Eds.), Essentials of medical geology—impacts of the natural environment on public health (pp. 227–262). London: Elsevier Academic Press.