“Biogenic Synthesis of ZnO-CuO Heterojunction Nanoparticles Using Callistemon Citrinus Plant Extract and Evaluation of Photocatalytic Activity”. NextGen Chemical Discoveries , vol. 2, no. 2, June 2026, pp. 46-60, https://novalexpress.com/NGCD/index.php/ngcd/article/view/22.