1. GKSS Forschungszentrum, W-2054 Geesthacht, Federal Republic of Germany
2. Institut Laue-Langevin, F-38042 Grenoble, France
3. University of Illinois at Chicago, Department of Chemistry Chicago, Illinois 60689
4. Max-Planck-Institut fiir Molekulare Genetik, Berlin, Federal Republic of Germany
5. European Organization for Nuclear Research, PPE, CH-1211, Geneva, Switzerland