1. Moscow State University, 119991 Moscow, Russia
2. Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
3. IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
4. Department of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia
5. Institut für Festkörperphysik, TU Dresden, Mommsenstrasse 13, D-01069 Dresden, Germany
6. Faculty of Physics, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
7. Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Basovizza, Trieste, Italy
8. Kurnakov Institute of General and Inorganic Chemistry RAS, Leninsky Av. 31, 119991 Moscow, Russia
9. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991, Moscow, Russia