S. Sunarno, P. Purwanto, and S. Suryono "Trend Analysis of NO[latex]_X[/latex] and SO[latex]_2[/latex] Emissions in Indonesia from the Period of 1990 -2015 using Data Analysis Tool", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 257–263, 2021, doi: 10.25046/aj060129.