1. Haas, H., Shirley, D.A.: J. Chem. Phys.58, 3339 (1973)
2. Lis, S.A., Naumann, R.A.: Hyperf. Int.3, 283 (1977)
3. Heubes, P., Hempel, G., Ingwersen, M., Keitel, R., Klinger, W., Loeffler, W., Witthuhn, W.: Contributed papers of the Int. Conf. on hyperfine interactions studied in nuclear reactions and decay (Uppsala, Sweden, 1974) Karlsson, Wappling, R. (eds.) (University of Uppsala. Sweden, 1974) p. 208?9
4. Christiansen, J., Heubes, P., Keitel, R., Klinger, W., Loeffler, W., Sandner, W., Witthuhn, W.: Z. Physik B24, 177 (1976)
5. Heubes, P.: Thesis, Erlangen (1975)