Paul Sony, Iyanar Kannan and Pitchai Rathinam Thenmozhivalli (2023) “Effectiveness of COVID-19 vaccines: A systematic review”, Asian Journal of Medical Sciences, 14(11), pp. 306–314. Available at: https://nepjol.info./index.php/AJMS/article/view/55746 (Accessed: 26 April 2025).