1. For a general review on cerium metal see: D.C. Koskenmaki and K.A. Gschneider, Jr. in: Handbook on the physics and chemistry of rare earth, Vol. 1, eds. K.A. Gschneider and L. Eyring (North-Holland, Amsterdam, 1978) p. 337.
2. H.H. Bertschat, H.-E. Mahnke, E. Dafni, F.D. Davidovsky, and M. Hass Phy. Lett. 101A, 507 (1984).
3. D. Riegel, Hyperfine Interactions 15/16, 603 (1983).
4. C. Gunther, I. Lindgren in: Perturbed angular correlations, eds. E. Karlson, E. Matthias, K. Siegbahn (North-Holland, Amsterdam 1964) p. 357.
5. H.H. Bertschat et al., Solid State Comm. 47, 525 (1983)