1. Institute of Crystallography; Russian Academy of Sciences; 119333 Moscow Russia
2. Institute of Geology and Mineralogy; University of Cologne; 50939 Cologne Germany
3. Institute of Optics and Atomic Physics; Technische Universität Berlin; 10623 Berlin Germany
4. Institute of Mineralogy and Crystallography; University of Vienna; 1090 Vienna Austria
5. Institute for Laser Science; University of Electro-Communications; 182-8585 Tokyo Japan