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2. R. Flükiger, J.L. Staudenmann and P. Fischer, J. Less-Common Metals, 50, 253 (1976).
3. E. C. Van Reuth, R.M. Waterstrat, R.D. Blaugher, R.A. Hein and J.E. Cox, Proc. LT 10, 137 (1967).
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5. R. Flükiger, unpublished. The results were made available to Moehlecke et al.4 for including in their paper.