Fourth International Conference on A.C. and D.C. Power Transmission : 23-26 September 1985 / organised by the Power Division of the Institution of Electrical Engineers in association with the CIGRE British National Committee, Institute of Electrical and Electronics Engineers Inc (United Kingdom and Republic of Ireland Section) : venue the Institution of Electrical Engineers, Savoy Place, London WC2R 0BL, UK. (IEE conference publication ;, 1985)