1. Drost-Hansen, W., First Symp. on Water Desalination, Washington, October 1965.
2. Drost-Hansen, W., Symp. on Equilibrium Concepts in Natural Water Systems, 151st Meeting, Pittsburgh, March 1966.
3. Blandamer, M. J., Fox, M. F., and Symons, M. C. R., Nature, 214, 163 (1967).
4. Blandamer, M. J., Claxton, T. A., and Fox, M. F., Chem. Phys. Lett., 1, 203 (1967).
5. Symons, M. C., Blandamer, M. J., and Fox, M. F., New Sci., 11, 345 (1967).