Khoiriah, Sabina Latifatul, and Wardhani Utami Dewi. “The Impact of Tobacco Production and Cultivated Area on the GRDP of the Agricultural Sector in Lampung Province: A Multiple Linear Regression Analysis”. Symmetry & Sigma: Journal of Mathematical Structures and Statistical Patterns 1, no. 2 (December 30, 2024): 165–182. Accessed January 30, 2026. https://ejournal.nurulimanmgm.or.id/index.php/symmetry-sigma/article/view/28.