edited by G. Izak and S. M. Lewis. edited by G. Bracchi, G. M. Nijssen. edited by G. Hall and J. M. Watt. edited by G. C. K. Roberts. edited by G. Letta and M. Pratelli. edited by G. N. Pande & O. C. Zienkiewicz. edited by D. M. Weir. edited by James M. Margolis. edited by G. P. Ellis. edited by R. M. A. Lieth.