Akimenko, Vitalii V. “Continuous Monocyclic and Polycyclic Age Structured Models of Population Dynamics”. Communication in Biomathematical Sciences 2, no. 2 (November 20, 2019): 85-95. Accessed October 23, 2025. https://journals.itb.ac.id/index.php/cbms/article/view/12306.