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- J.G. Bannenberg, W.H. Urbanus, R.G.C. Wojke
FOM-Institute for Atomic and Molecular Physics, Amsterdam, The Netherlands
- H. Klein, A. Schempp, R.W. Thomae, T. Weis
IAP, Frankfurt am Main, Germany
- P.W. van Amersfoort
FOM-Institute for Plasma Physics, Nieuwegein, The Netherlands
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