1. Institute of Nuclear Physics of CAS, v.v.i., Husinec-Rez, 250 68 Rez, Czech Republic
2. Department of Physics, Faculty of Science, University of J.E.Purkyně, 400 96 Usti nad Labem, Czech Republic
3. Department of Inorganic Chemistry, University of Chemistry and Technology, 166 28 Prague 6, Czech Republic