1. M Erbudak and F Meier,Physica B102, 134 (1980) and references therein
2. M S S Brooks,J. Phys. F14, 633 (1984) and references therein
3. C F VanDoorn and P de V DuPlessis,J. Magn. Magn. Mater.,5, 164 (1977)
4. J Neuenschwander, H Boppart, J Schoenes, E Voit, O Vogt and P Wachter14 Journess des Actinidides edited by Schoenes J (Zurich Edigenossiche Technische Hochschule 1984) p. 30
5. J S Olsen, S Stenstrup, L Gerward, V Bendict, J C Spirlet and G D Andrectt,J. Less Common. Met. 98, 291 (1984)