1. H. Frauenfelder and R.M. Steffen, in:Alpha-, Beta-and Gamma-Ray Spectroscopy, ed. K. Siegbahn, Vol. 2 (North-Holland, Amsterdam 1965) p. 997.
2. G. Kaindl and H. Haas, eds.:Proc. V. Intern. Conf. on Hyperfine Interactions, Berlin 1980, Hyp. Int. 9/10 (1981).
3. L. Niesen, F. Pleiter and H. de Waard, eds.:Proc. VI. Intern. Conf. on Hyperfine Interactions, Groningen 1983, Hyp. Int. 15/16 (1983).
4. H.G. Devare, P.N. Tandon and S.H. Devare, eds.:Proc. VII. Intern. Conf. on Hyperfine Interactions, Bangalore 1986, Hyp. Int. 34/35 (1987).
5. Th. Wichert and E. Recknagel, in:Microscopic Methods in Metals, ed. U. Gonser (Springer, Berlin 1986 p. 317.