1. G. Andermann and J. W. Kemp, “Scattered X-Rays as Internal Standards in X-Ray Emission Spectroscopy,” Anal. Chem. 30, No. 8, 1306–1309 (1958).
2. F. W. Lytle, W. B. Dye and H. J. Seim, “Determination of Trace Elements in Plant Material by Fluorescent X-Ray Analysis,” Advances in X-Ray Anal, 5, 433–446 (1962).
3. C. Shenberg, A. B. Haim and S. Amiel, “Accurate Determination of Copper in Mixtures and Ores by Radioisotope-Excited X-Ray Fluorescence Spectrometry Analysis Using Peak Ratios,” Anal. Chem. 45, 1804–1808 (1973).
4. B. C. Clark and A. K. Baird, “Ultraminiature X-Ray Fluorescence Spectrometer for In-Situ Geochemical Analysis on Mars,” Earth and Planetary Science Letters 19, 359–368 (1973).
5. W.A.P. Nicholson and T. A. Hall, “X-Ray Fluorescence Microanalysis of Thin Biological Specimens,” J. of Physics 6, 1781–1784 (1973).