1. Nambi K.S.V., A review of the studies on the high background radiation areas of the world in,III Proceedings of the National Symposium on Environment, Thiruvanandapuram,1994.
2. BARC Report, Distribution of Natural Radioactivity and Trace elements in the soils and sands from the high radiation coastal belt of India, Health Physics Division, BARC, Mumbai, 1974.
3. Natural radionuclide distribution in soils of Cáceres (Spain): Dosimetry implications