edited by D. Faulkner, M.J. Cowling and P.A. Frieze. edited by A. Auslender, W. Oettli, and J. Stoer. edited by K. Bleuler, H.R. Petry and A. Reetz. edited by D. Brian Spalding and N.H. Afgan. edited by E.L. Allgower, K. Glashoff, and H.-O. Peitgen. edited by Paul P. Wang and S. K. Chang. edited by R. Buscall, T. Corner, and J.F. Stageman.