Zahra, Samreen, et al. “Effect of Calcination Temperature on the Structure and Morphology of Zinc Oxide Nanoparticles Synthesized by Base-Catalyzed Aqueous Sol-Gel Process”. European Journal of Chemistry, vol. 13, no. 2, June 2022, pp. 162-7, doi:10.5155/eurjchem.13.2.162-167.2231.