1. G. Van Oost et al.: Plasma Phys. Control. Fusion 45 (2003) 621.
2. H. Kugel et al.: Bull. Am. Phys. Soc. 42 (1997) 2044.
3. V. Weinzettl, I. Duran, J. Zajac, and V. Piffl: Czech. J. Phys. 53 (2003) 925.
4. M. Hron et al.: in Proc. 2nd REFPCE, Maastricht, The Netherlands, June 19–20, Czech. J. Phys. 49 (1999) Suppl. S3, p. 181.
5. V. Weinzettl, J. Matejicek, V. Piffl, and S. Polosatkin: in 31st EPS Conference on Plasma Phys., London, 28 June–2 July 2004, (Eds. P. Norreys and H. Hutchinson), ECA, Vol. 28G (2004) P-5.139.