1. Bettinelli, M., Spezia, S., Minoia, C. and Ronchi, A. (2002) Determination of Chlorine, Fluorine, Bromine, and Iodine in Coals with ICP-MS and I.C. Atomic Spectroscopy 23(4), 105-110.
2. Inorganic composition of Belgian coals and coal ashes
3. Cosgrove, M. E. (1970) Iodine in the bituminous Kimmeridge Shales of the Porset Coast, England. Geochim. Cosmochim. Acta 34(7), 830-836.
4. The geochemistry of iodine — a review
5. Guangwei, Z. (1998) The geochemical distribution of Iodine in atmosphere and plants and its effects to human health. Master degree Thesis, Institute of Geochemistry, The Chinese Academy of Sciences, China, 60 pp.