1. Bethe, H. (1930), Annl. Phys. 5, 325.
2. Csillag, S.; Johnson, D. R.; and Stern, E. A. (1981), in “EXAFS Spectroscopy” (B. K. Teo and D. C. Joy, ed.), Plenum Press, New York, p. 241.
3. Egerton, R. F. (1975), Phil. Mag. 31, 199.
4. — (1979), Ultramicroscopy 4, 69.
5. — (1980), Proc. 38th Annl. Mtg. EMSA (G. W. Bailey, ed.), Claitor’s Pub. Div., Baton Rouge, p. 130.