Harrison, R. A. (Birmingham, University United Kingdom)
Waggett, P. W. (Birmingham Univ. United Kingdom)
Bentley, R. D. (London, University College, Dorking, United Kingdom)
Phillips, K. J. H. (SERC Rutherford Appleton Laboratory, Didcot, United Kingdom)
Bruner, M. (Lockheed Research Laboratories Palo Alto, CA, United States)