1. Department of Materials and Environmental Chemistry
2. Arrhenius Laboratory
3. Stockholm University
4. S-106 91 Stockholm
5. Sweden
6. Institute of Materials Research of the Slovak Academy of Sciences
7. Kosice
8. Slovakia
9. Faculty of Materials Science and Technology in Trnava
10. Slovak University of Technology in Bratislava
11. 916 24 Trnava
12. Slovak Republic