1. Institut za nuklearne nauke Vinča, Univerzitet u Beogradu, 11001 Beograd, Serbia
2. School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, UK
3. Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaounde I, PO Box 812, Cameroon
4. Bashkir State University, 32 Zali Validi Street, 450076 Ufa, Republic of Bashkortostan, Russia