1. University North, University Center Varaždin, Jurja Križanića 31b, HR-42000 Varaždin, Croatia
2. Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Ulica cara Hadrijana 8/A, HR-31000 Osijek, Croatia
3. University of Zagreb, Faculty of Science, Department of Chemistry, Horvatovac 102a, HR-10000 Zagreb, Croatia