1. P. Nielsen, S. A. Arshad, and C. W. Gowers, Proceedings of the 26th European Physical Society Conference on Controlled Fusion and Plasma Physics, Maastricht, Holland, 14–18 June 1999, ECA 23J, p. 281.
2. C. W. Gowers, S. A. Arshad, and P. Nielsen, Proceedings of the Ninth International Symposium on Laser-Aided Plasma Diagnostics, Lake Tahoe, CA, 26 September–1 October 1999.
3. S. A. Arshad, C. W. Gowers, and P. Nielsen, JET Internal Report, No. JET-R(98)06.