edited by D. G. Land and H. E. Nursten. edited by G. Bracchi, G. M. Nijssen. edited by C. H. Dash and H. E. H. Jones. edited by D. H. Hey and D. I. John. edited by D. C. E. Speller. edited by M.E. Fayed, L. Otten. edited by C. G. Scott and C. E. Reed. edited by D. A. Brannan, J. G. Clunie. edited by P. G. Le Comber and J. Mort. edited by D. G. Ashwell and R. H. Gallagher.