Hamad, F., Salem Abdulkarim, and Ayman Hamad. “Mixture Method to Estimate Baseline Hazard for Non-Arbitrary Function of the Cox Proportional Model”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 62, no. 2, May 2022, pp. 235-48, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/14023.