“Structural Characterization of NiO/Cr2O3Composites and Hydrothermal Synthesis, Properties Gas Sensing”, ANJS, vol. 21, no. 1, pp. 59–64, Mar. 2018, Accessed: Nov. 24, 2024. [Online]. Available: https://mail.anjs.edu.iq/index.php/anjs/article/view/155