حسين رشيد ظافر. “Comparison of Spline Methods for Estimating Nonparametric Regression Curve”. IRAQI JOURNAL OF STATISTICAL SCIENCES 5, no. 1 (December 1, 2005): 40–62. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/stats/article/view/29462.