1. J.W. Thatcher and W.J. Campbell, “Fluorescent X-Ray Spectrographic Probe-Design and Applications,” U.S. Bur. Mines Rept. Invest. 5500, 1959, 23 pp.
2. J.W.M. DuMond, “Crystal Diffraction Spectroscopy of Nuclear X-Rays,” in K. Siegbahn (ed.), Beta-and Gamma-Ray Spectroscopy, North-Holland Publishing Co., Amsterdam, 1955, p. 100.
3. L.S. Birks and E.J. Brooks, “Uniform Plastic Bending of Crystals for Focusing X-Ray Radiation,” Rev. Sci. Instr., Vol. 24, 1953, p. 992.
4. J.W. Kemp and G. Andermann, “Cylindrical Crystal X-Ray Optics,” 5th Annual Conf. on Industrial Applications of X-Ray Analysis, Denver Research Institute, Denver, Colo., August 1956.