1. Department of Biology, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000 Osijek, Croatia
2. Elementary School Matija Antun Reljković Cerna, Šetalište Dr. Franje Tuđmana 3, 32272 Cerna, Croatia
3. Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, 31000 Osijek, Croatia