1. A. B. MacKenzie, R. D. Scott, I. G. McKinley, J. M. West, British Geological Survey Report. FLPU 83-6.
2. M. P. Bacon, J. N. Rosholt,Geochim. Cosmochim. Acta, 46 /1982/ 651.
3. J. A. T. Smellie, A. B. MacKenzie, R. D. Scott,Chem. Geol. /in press/.
4. R. L. Health, CRC Handbook of Chemistry and Physics 55th Edition, 1975, B248.
5. K. Govindajaru,Geostandards Newsletter, Vol. 8, Special Issue /1984/.