A. J. Mohammed, J. J. Hassan, S. J Kasim, and M. A. Mahdi, “Structural, Morphological, and Optical Properties of Zinc Oxide Nanorods for LPG sensor”, JK-Physics, vol. 9, no. 2, pp. 140–148, Dec. 2017, doi: 10.31257/2018/JKP/2017/v9.i2.9430.