1. O. Hartmann, E. Karlsson, L.O. Norlin, D. Richter, and T.O. Niinikoski, Phys. Rev. Lett.41 (1978) 1055
2. W.J. Kossler, A.T. Fiory, W.F. Lankford, K.G. Lynn, R.P. Minnich, and C.E. Stomach, Hyperfine Interactions6 (1980) 295
3. M. Doyama, R. Nakai, H. Fukushina, N. Nishida, Y.J. Uemura, and T. Yamazaki, Hyperfine Interactions6 (1980) 341
4. R. Kubo and T. Toyabe, in Magnetic Resonance and Relaxation, ed. R. Blinc (North-Holland, Amsterdam, 1967) p. 810
5. T. Hatano, Y. Suzuki, T. Natsui, M. Doyama, Y.J. Uemura, T. Yamazaki, and J.H. Brewer, Proc. Int. Conf. on point defects and defect interactions in metals, Kyoto, 1981, ed. J. Takamura, M. Doyama and M. Kiritani (University of Tokyo Press, Tokyo, 1982) p. 274