edited by H.D. Bui and Q.S. Nguyen. edited by R.W. Frei and J.F. Lawrence. edited by L.S. Bark and N.S. Allen. edited by E.S. Vizi and K. Magyar. edited by H.C. Gooi and H. Chapel. edited by C.E. Vandoni and D.A. Duce. edited by F.T. Arecchi and F.R. Auusenegg. edited by N. B. Urli and J. W. Corbett. edited by R.W. Frei and K. Zech. edited by W. Palz and C. den Ouden.