Fatmawati AI, Lubis RS. Estimated Sulfur Dioxide Pollutant Concentrations In Medan City Using Ordinary Kriging and Inverse Distance Weighting Approaches. Mathline [Internet]. 2024 Jan. 5 [cited 2026 Feb. 7];9(1):13-30. Available from: http://mathline.unwir.ac.id/index.php/Mathline/article/view/548