1. Silesian Intercollegiate Center for Education and Interdisciplinary Research & Institute of Physics
2. University of Silesia
3. 41-500 Chorzów, Poland
4. Institute of High Pressure Physics
5. Polish Academy of Sciences
6. 01-142 Warsaw, Poland
7. University of Bern
8. Bern CH-3012, Switzerland
9. V. Bakul Institute for Superhard Materials of the National Academy of Superhard materials NASU
10. 04074 Kiev, Ukraine