Buchheit, Roman, 		Acosta-Humánez, F., AND 		Almanza, O..
"Structural, EPR and Optical Studies on Cu-doped ZnO Nanoparticles Synthesized by the Sol-Gel Method at Different Calcination Temperatures" <em>Revista Cubana de Física</em> [Online], Volume 33 Number 1 (14 July 2016)