1. Global Tungsten and Powders Corp., Towanda, Pennsylvania 18848
2. Freie Universität Berlin, Germany, D-14195 Berlin, Germany
3. National Laboratory, Los Alamos, New Mexico 87545
4. Leibniz Institute for Catalysis at Rostock University, D-18059 Rostock, Germany
5. Humboldt-Universität zu Berlin, Institut für Chemie, D-12489 Berlin, Germany