Ekhwan Toriman, Mohd, et al. “Trends Analysis of Ozone Hole Annual Records Using SBUV Data Version 8.6 (1979 to 2017 Datasets)”. International Journal of Engineering and Technology, vol. 7, no. 3.14, July 2018, pp. 30-34, https://doi.org/10.14419/ijet.v7i3.14.16858.