1. Phillips, J. C. & Hodgson, K. O. in Synchrotron Radiation Research (eds Winick, H. & Doniach, S.) (Plenum, New York, 1980).
2. Helliwell, J. R. et al. J. Phys. E (in the press).
3. Underwood, J. H. & Turner, D. Soc. Photoopt. Inst. Eng. 106, 125 (1977).
4. Lemonnier, M., Fourme, R., Rousseau, F. & Kahn, R. Nucl. Inst. Meth. 152, 173–177 (1978).
5. Hendrix, J., Koch, M. J. & Bordas, J. J. appl. Crystallogr. 12, 467–472 (1979).