1. Hall, H. T., Rev. Sci. Instr., 29, 267 (1958).
2. Hall, H. T., Rev. Sci. Instr., 31, 125 (1960).
3. Bundy, F. P., in Modern Very High Pressure Techniques, edit. by Wentorf, R. H., 1 (London, Butterworths, 1962).
4. Ashcroft, K., and Lees, J., Nature, 198, 957 (1963).
5. Tydings, J. E., and Giardini, A. A., in High Pressure Measurements, edit. by Giardini, A. A., and Lloyd, E. C., 200 (Washington, Butterworths, 1963).