1. Afzal S, Younas M, Ali K (2000) Selenium speciation studies from Soan-Sakesar Valley, salt range, Pakistan. Water Int 25:425–436
2. Akesson B, Steen B (1987) Plasma selenium and glutathione peroxidase in relation to cancer, angina pectoris and short-term mortality in 68-year-old men. Comprehens Gerontol A 1:61–64
3. Alfthan G, Xu GL, Tan WH, Aro A, Wu J, Yang YX, Liang WS, Xue WL, Kong LH (2000) Selenium supplementation of children in a selenium-deficient area in China—blood selenium levels and glutathione peroxidase activities. Biol Trace Elem Res 73(2):113–125
4. Amouroux D, Liss PS, Tessier E, Hamren-Larsson M, Donard OFX (2001) Role of the oceans as biogenic sources of selenium. Earth Planet Sci Lett 189(3–4):277–283
5. Ander EL, Fordyce FM, Johnson CC, Schofield DI (2010) Controls on the distribution of selenium in the soils of East Anglia, UK. Geological society of America abstract section meeting, Baltimore, Maryland, 13–16 March, p 143