1. R.C. Reynolds,Am. Mineral. 48: 1133 (1963).
2. R.C. Reynolds,Am. Mineral. 52: 1493 (1967).
3. R. Tertian and F. Claisse, “Principles of Quantitative X-ray Fluorescence Analysis”. p 31. Heyden, London (1982).
4. J.C. Mills, K.E. Turner, P.W. Roller and C.B. BelcherX-ray Spectrom. 10: 131 (1981).
5. K. Norrish and B.W. Chappell, in “Physical Methods in Determinative Mineralogy”, ed. J. Zussman. 2nd edition. p 484. Academic Press, New York (1977).