A. Ismardi, V. P. Lestari, N. H. Abdullah, I. W. Fathona, and T. D. Gunawan, “ZnO Nanostructure Synthesized by Hydrothermal Method for Butane Gas Sensor”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 13, no. 3, pp. 816–821, May 2023.