"Using Principal Component Analysis (PCA) Techniques to Improve Multiple Regression Performance in High-Dimensional Data" (2026) Al Kut Journal of Economics and Administrative Sciences, 18(61), ص 177–205. موجود في: https://kjeas.uowasit.edu.iq/index.php/kjeas/article/view/1186 (تاريخ الوصول: 26 سبتمبر 2026).