1. P. Pakalns and H. T. Lane, Mikrochim. Acta [Wien]1979 I, 259.
2. Clean Waters Act (1970), New South Wales, Australia.
3. Proposed Criteria for Water Quality, Washington: US Environmental Protection Agency (1973).
4. International Commission on Radiological Protection (ICRP), Publication No. 2, Oxford: Pergamon Press. 1959.
5. D. A. Johnson and T. M. Florence, Analyt. Chim. Acta53, 73 (1971).