1. P.F. Meier in “Proceedings of the Workshop on Low Energy Muon Science”, Santa Fe, 4–8 April 1993, to be published; also these proceedings
2. F.L. Pratt, private communications.
3. B.D. Patterson, Rev. Mod. Phys.60 (1988) 69
4. T.A. Claxton, D.J. Maric, P.F. Meier, Phys. Rev. B, in press, May 1993
5. T.A. Claxton, D.J. Maric, P.F. Meier, Chem. Phys. Lett.192 (1992) 29