W. Widiyastuti, S. Machmudah, T. Nurtono, S. Winardi, R. Balgis, T. Ogi, K. Okuyama, Morphology and Optical Properties of Zinc Oxide Nanoparticles Synthesised by Solvothermal Method, Chemical Engineering Transactions. 56 (2017) 955-960. doi:10.3303/CET1756160.