“Stratified Cox Regression Approach to Identifying Prognostic Factors for Survival in Breast Cancer Patients”. UNP Journal of Statistics and Data Science 3, no. 4 (November 30, 2025): 406–412. Diakses Oktober 3, 2026. https://ujsds.ppj.unp.ac.id/index.php/ujsds/article/view/418.