Porobić Slavica; Lađarević Jelena; Kojić Marija; Katnić Djurica; Marinović-Cincović Milena; Tadić Julijana; Mijin Dušan: Optical and antioxidative properties of 5-(2,6-Dimethylphenyl)- 6-Hydroxy-4-Methyl-2-Oxo-1,2-Dihydropyridine-3-Carboxamide.