4) G.S. Knapp and F.Y. Frandin : “Electron and Positron Spectroscopies in Materials Science and Engineering (eds. O. Buck et al.)”, (Academic Press, N.Y., 1979) p. 377.
5) B.K. Teo and D.C. Joy : “EXAFS Spectroscopy. Technique and Applications”, (Plenum. N.Y., 1981).