1. F. Grandjean, G. J. Long, O. A. Pringle, and J. Fu, Hyperfine Interactions, 62, 131 (1990).
2. NATO-ASI Series C;S Mørup,1988
3. NATO-ASI Series C;F Grandjean,1988
4. N. N. Greenwood and T. C. Gibb, Mössbauer Spectroscopy, Chapman and Hall, London (1981).
5. E. Murad and J. H. Johnston, “Iron Oxides and Oxyhydroxides,” in Mössbauer Spectroscopy Applied to Inorganic Chemistry, Vol. 2, G. J. Long, ed., Plenum Press, New York (1989) p. 507.