edited by H.-J. Warnecke and R. Steinhilper. edited by S.M. Perren and E. Schneider. edited by A. S. Strub and H. Ehringer. edited by A.G. Milnes and C.J. Miner. edited by C. R. Brundle and A. D. Baker. edited by C.H. Bamford and C.F.H. Tipper. edited by G. Cochard and P. Kessler. edited by I.M. MacLeod and A.D. Heher. edited by K.A. Benedict and J.T. Chalker. edited by W. J. Irvine and J. F. Porter.