PHOTOCATALYTICAL ACTIVITIES OF MANGANESE DOPED ZINC OXIDE NANOPARTICLES PREPARED BY SOL-GEL METHOD. - (BUŞILĂ) IBĂNESCU, Mariana; MUŞAT, Viorica; TEXTOR, Torsten; MAHLTIG, Boris (Annals of the University Dunarea de Jos of Galati: Fascicle IX, Metallurgy & Materials Science, 2013)