1. Gerard, A. & Delmelle, M. C. r. hebd Séanc Acad. Sci., Paris 259, 1756–1759 (1964).
2. Muir, A. H. & Blander, M. in Proc. Conf. Application of the Mössbauer Effect (ed. Dezsi, I.) 61–72 (Akademiai Kiado, Budapest, 1971).
3. Sawatzky, G. A., Coey, J. M. D. & Morrish, A. H. J. appl. Phys. 40, 1402–1403 (1969).
4. Kundig, W., Bommel, H., Constabaris, G. & Lindquist, R. H. Phys. Rev. 142, 327–333 (1966).
5. van der Kraan, A. M. Phys. Stat. Sol. a18, 215–226 (1973).