Lukman, A. F., Arowolo, O., & Ayinde, K. (2014). Some Robust Ridge Regression for handling Multicollinearity and Outlier. International Journal of Sciences: Basic and Applied Research (IJSBAR), 16(2), 192–202. Retrieved from https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/2320