Fatmawati, Ayu Isnaini, and Riri Syafitri Lubis. 2024. “Estimated Sulfur Dioxide Pollutant Concentrations In Medan City Using Ordinary Kriging and Inverse Distance Weighting Approaches”. Mathline : Jurnal Matematika Dan Pendidikan Matematika 9 (1):13-30. https://doi.org/10.31943/mathline.v9i1.548.