edited by J. T. Devreese and V. E. van Doren. edited by J. H. Burnett & A. P. J. Trinci. edited by J.W. de Bakker and J.C. van Vliet. edited by C. V. Harrison, K. Weinbren. edited by D. G. Land and H. E. Nursten. edited by F. T. Arecchi and V. Degiorgio. edited by J. V. Sanders and D. J. Goodchild. edited by A. E. Dixon and J. D. Leslie. edited by J.Boogaard and G.M.van Dijk.