1Department of Chemistry, University College Swansea, Singleton Park, Swansea, SA2 8PP, UK
2Laboratory of the Government Chemist, Cornwall House, Stamford Street, London, SEI 9NQ, UK
3B.P. Research Centre, Sunbury-on-Thames, TW16 7LN, UK
4Department of Electronic Enfineering, UMIST, Manchester, M60 1QD, UK
Copyright © 1982 Hindawi Publishing Corporation.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.