1. B. Mason, Principles of Geochemistry, Wiley, New York, 1966.
2. C.S. Hurblut and C. Klein, Manual of Mineralogy, 19th edition, Wiley, New York, 1977.
3. L.H. Bowen, Mössbauer Effect Ref. Data J. 2, 76 (1979).
4. G.M. Bancroft, Mössbauer Spectroscopy, An Introduction for Inorganic Chemists and Geochemists, Van Nostrand, London, 1973.
5. S.S. Hafner, in Mössbauer Spectroscopy, U. Gonser, ed., Springer, Berlin, 1975, p. 167.