Faker Al-Dean Fadel, I., ابتهال, M. Al-Hashimi, and مزاحم. “Locally Weighted Regression for Sunspots Estimation and Prediction”. IRAQI JOURNAL OF STATISTICAL SCIENCES, vol. 19, no. 2, June 2025, pp. 15-23, https://rjps.uomosul.edu.iq/index.php/stats/article/view/20896.