Hadib Abbas, Huda, and Suhail Najim Abood. “Comparison of Robust Circular S and Circular Least Squares Estimators for Circular Regression Model Using Simulation”. Journal of Economics and Administrative Sciences 28, no. 134 (December 31, 2022): 168–185. Accessed December 21, 2024. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/2429.