1. Barbee, T. W. & Keith, D. C. in Workshop on Instrumentation for Synchrotron Radiation Research (eds Winick, H. & Brown, G.) III-36 (Stanford Synchrotron Radiation Laboratory Report No. 78/04, 1978).
2. Barbee, T. W. Proc. AIP Topical Conf. on Low Energy X-Ray Diagnostics, California (in the press).
3. Franks, A. Sci. Prog. Oxf. 64, 371 (1977).
4. Underwood, J. H. Am. Sci. 66, 476 (1978).
5. Underwood, J. H. & Barbee, T. W. Proc. AIP Topical Conf. on Low Energy X-ray Diagnostics, California (in the press).