M. Elgohary, Mervat, Mohamed R. Abonazel, Nahed M. Helmy, and Abeer R. Azazy. “New Robust-Ridge Estimators for Partially Linear Model”. International Journal of Applied Mathematical Research 8, no. 2 (November 17, 2019): 46–52. Accessed May 5, 2024. https://sciencepubco.com/index.php/ijamr/article/view/29932.