1. Faculty of Technology and Metallurgy
2. University of Belgrade
3. 11000 Belgrade
4. Serbia
5. Institute for Solid State Physics and Optics
6. Wigner Research Centre for Physics
7. Hungarian Academy of Sciences
8. Budapest
9. Hungary
10. Institute of Chemical Technology Prague
11. 166 28 Prague
12. Czech Republic
13. Liquid Crystal Institute
14. Kent State University
15. Kent
16. USA
17. Department of Physics