1. University of Kragujevac, Institute for Information Technologies, Department of Science, Jovana Cvijica bb, 34000 Kragujevac, Serbia
2. University of Belgrade, Vinca Institute of Nuclear Sciences – National Institute of the Republic of Serbia, Department of Atomic Physics, Belgrade, Serbia
3. University of Kragujevac, Faculty of Science, Department of Biology and Ecology, Radoja Damjanovic 12, Kragujevac, Serbia