Sadeek, Najlaa, and نجلاء. 2025. “Spatial Prediction of Real Sulfur Data Using the Ordinary Kriging. Technique and Lognormal Kriging”. IRAQI JOURNAL OF STATISTICAL SCIENCES 19 (1):38-45. https://rjps.uomosul.edu.iq/index.php/stats/article/view/21000.