G. H. Mohammed, T. B. Hassan, and Z. T. Abdulhamied, “Structural Characterization of NiO/Cr2O3Composites and Hydrothermal Synthesis, Properties Gas Sensing”, Al-Nahrain J. Sci., vol. 21, no. 1, pp. 59–64, Mar. 2018, Accessed: May 22, 2026. [Online]. Available: https://mail.anjs.edu.iq/index.php/anjs/article/view/155