1. Allum, C.J. (1982b). Ph.D. Thesis, Cranfield Institute of Technology, Bedford MK43 0AL, England.
2. Allum, C.J. (1982c). Welding and Metal Fabrication, April.
3. Allum, C.J. (1982d). Proceedings of 7th International Conference on Gas Discharges and Their Applications, 377–380.