1. Nagarajan, R.: Theoretical and Experimental Aspects of Valence Fluctuations and Heavy Fermions, Gupta, L.C., Malik, S.K. (eds.), New York: Plenum Press 1987, p. 307.
2. Ströbel, J.P., Simmerl, M., Adrian, H., Thomä, A., Adrian, G., Hensel, B., Saemann-Ischenko, G.: J. Magn. Magn. Mater. 76&77 (1988) 536.
3. Abd-Elmeguid, M.M., Sauer, Ch., Köbler, U., Zinn, W.: Z. Phys. B 60 (1985) 239.
4. Sampathkumaran, E.V., Vijayaraghavan, R., Gopalakrishnan, K.V., Pilley, R.G., Devare, H.G., Gupta, L.C., Post, B., Parks, R.D.: Valence Fluctuations in Solids, Falicov, L.M., Hanke, W., Maple, M.B. (eds.), Amsterdam: North-Holland 1981, p. 193.
5. Sauer, Ch., Galinski, G., Zinn, W., Abd-Elmeguid, M.M.: Solid State Commun. 62 (1987) 265.