1. B.D. Patterson, A. Hintermann, W. Kündig, P.F. Meier, F.Waldner, H. Graf, E. Recknagel, A. Weidinger and Th.Wichert, Phys. Rev. Lett.40 (1978) 1347
2. For a survey of the newest literature see: Proceedings of the Yamada Conference on Muon Spin Rotation and Associated Problems April 18–22, 1983 in Shimoda, Japan (to be published in Hyp. Int)
3. S.G. Barsov, A.L. Getalov, V.A. Gordeev, V.A. Evseev, R.F. Konopleva, S.P. Kruglov, V.I. Kudinov, L.A. Kuz'min, S.M. Mikirtychants, E.V. Minaichev, G.G. Myasishcheva, Y.V. Obukhov, G.I. Savel'ev, V.G. Firsov and G.V. Shcherbakov, Yamada, Conference on Muon Spin Rotation and Associated Problems, April 18–22, 1983 in Shimoda, Japan (to be published in Hyp. Int.)
4. E. Albert, A. Möslang, E. Recknagel and A. Weidinger, Yamada Conference on Muon Spin Rotation and Associated Problems, April 18–22, 1983 in Shimoda, Japan (to be published in Hyp. Int.)
5. G.D. Watkins, in Lattice Defects in Semiconductors 1974 (Inst. Phys. Conf. No. 23, London, 1975), p. 1