N. T. Thu Ha, “Identifying factors affecting the early retirement decisions of employees: Meaning for Vietnam to reduce the potential labour shortages due to the population ageing”, TCKHXHNV, vol. 2, no. 5, pp. 587–597, Oct. 2025, Accessed: Jul. 03, 2026. [Online]. Available: https://ojsnv.metatekvn.com/index.php/JOSSH-VN/article/view/231