Siagian, R. C. (2025) “Modeling Sunspot Activity Variability and Autoregulation in the Period 2000-2018 with Advanced Statistical Approach”, MUNISI: Military Mathematics and Natural Sciences, 3(2), pp. 62–78. Available at: https://upgradeojs.rifqisyams.id/index.php/munisi/article/view/19786 (Accessed: 23 July 2026).