Fattah, A. M. A., & Rady, E. A. (2016). On Sampling Distribution of Improved Estimators for Coefficients in Seemingly Unrelated Regression SUR Models. International Journal of Sciences: Basic and Applied Research (IJSBAR), 26(2), 94–103. Retrieved from https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3889