1. University of Belgrade, Faculty of Biology, Institute of Botany and Botanical Garden “Jevremovac”, Belgrade, Serbia
2. University of Belgrade, Institute for Biological Research "Siniša Stanković"- National Institute of the Republic of Serbia, Belgrade, Serbia
3. University of Al-Zintan, Faculty of Science, Zintan, Libya
4. National Research Center for Tropical and Transboundary Diseases, Zintan, Libya