1. Institute of Crystallography; Russian Academy of Sciences; Leninsky prospect 59 119333 Moscow Russia
2. Institute of Optics and Atomic Physics; Technical University of Berlin 10623 Berlin Germany
3. Institute for Laser Sciences; University of Electro-communications; Tokyo 182-8585 Japan
4. Institute of Crystallography; University of Cologne; Greinstr. 6 50939 Köln Germany