Lukman, Adewale Folaranm1, Olatunji Arowolo, and Kayode Ayinde. 2014. “Some Robust Ridge Regression for Handling Multicollinearity and Outlier”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 16 (2):192-202. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/2320.