1. Institute for Solid State Physics and Optics
2. Wigner Research Centre for Physics
3. Hungarian Academy of Sciences
4. H-1525 Budapest
5. Hungary
6. Institute of Experimental Physics
7. Slovak Academy of Sciences
8. 040 01 Košice
9. Slovakia
10. Grenoble High Magnetic Field Laboratory
11. CNRS
12. Grenoble
13. France