1. GRAPES, rue de la Belle Jardiniere, 483/0021, B-4031, Liege Angleur, Euroland, Belgium
2. Department of Chemistry, University of Liège, B6C LCIS – GreenMAT, B-4000 Liège, Belgium
3. Department of Physics, University of Technology and Life Sciences, Institute of Mathematics and Physics, PL-85-796 Bydgoszcz, Poland
4. Bulgarian Academy of Sciences, Institute of Mechanics, Acad. G. Bonchev Str., Bl. 4, BG-1113 Sofia, Bulgaria