edited by G. K. Horton and A. A. Maradudin. edited by I.D. Morton, A.J. MacLeod. edited by L. Marton and C. Marton. edited by W. L. Van der Poel and L. A. Maarssen. edited by D. A. Brannan, J. G. Clunie. edited by G. G. Birch and K. J. Parker. edited by K. W. McVoy and W. A. Friedman. edited by L. B. Sand and F. A. Mumpton. edited by R.J. Hamilton and A. Bhati. edited by E. G. Derouane and A. A. Lucas.