1. Institute of Chemistry, Faculty of Natural Sciences and MathematicsSs. Cyril and Methodius University POB 162 1001 Skopje Republic of Macedonia
2. Department of Material Science and Engineering, Faculty of Engineering and ArchitectureAnadolu University Eskişehir Turkey
3. National and University Library “St Kliment Ohridski” Bul. Goce Delčev, 6 1000 Skopje Republic of Macedonia