1. Kernforschungsanlage Jülich GmbH Postfach 1913, 5170 Jülich, Federal Republic of Germany
2. U. K. Atomic Energy Authority Harwell, Oxfordshire OX11 0RA, United Kingdom
3. Hahn-Meitner Institut Glienicker Strasse 1000, 1000 Berlin 39 Federal Republic of Germany