1. Oak Ridge National Laboratory P.O.Box 2009, Bldg. 9204–1 Oak Ridge, TN 3 7831 (0615)574–1450
2. Japan Atomic Energy Research Inst. Naka-machi, Naka-gun, Ibaraki-ken 311-02 Japan
3. Kernforschungszentrum Karlsruhe Postfach 3640 D–7500 Karlsruhe, FRG (07247)822653
4. Paul Scherrer Institute CH-5234 Villigen, Switzerland 056/993272