1. Jenkins R, Gould RW, Gedcke D (1981) Quantitative X-ray spectrometry. Marcel Dekker, New York
2. Tertian R, Claisse F (1982) Principles of quantitative X-ray fluorescence analysis. Heyden, London
3. Bowman HH, Hyde EK, Thompson SG, Jared RC (1966) Science 151:562
4. De Vries JL, personal communication
5. Skillicorn B (1982) Adv X-Ray Anal 25:49