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3. Mowat, J.R., Sellin, I.A., Pegg, D.J., Peterson, R.S., Macdonald, J.R., Brown, M.D.: Phys. Rev. Lett.30, 1289 (1973)
4. See review by H.G. Berry, Rep. Prog. Phys.40, 155 (1977)
5. Mann, R., Folkmann, F., Groeneveld, K.-O.: Phys. Rev. Lett.37, 1674 (1976)