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4. Raghavan, P., Raghavan, R.S.: Phys. Rev. Lett.27, 724 (1971) Raghavan, R.S., Raghavan, P.: Phys. Lett.36A, 313 (1971)
5. Heubes, P., Hempel, G., Ingwersen, H., Keitel, R., Klinger, W., Loeffler, W., Witthuhn, W.: In: Ref. 1, p. 208