1. See, for example, P. Herzog inLow Temperature Nuclear Orientation, edited by N. J. Stone and H. Postma (Elsevier, Amsterdam, 1986) Appendix B.
2. I. Berkesibid. Chapter 5.
3. K.-H. Ebeling, R. Eder, E. Hagn and E. Zech in Proc. VIIIth Int. Symp. on NQR (Darmstadt, 1985) 85.
4. M. Aiga and J. Itoh, J. Phys. Soc. Jap. 31 (1971) 1844.
5. P. D. Johnston and N. J. Stone, J. Phys. C. 5 (1972) L303.