Varghese, Anila, Surachna, and Sidharth Sekhar Mishra. “Improving Last-Mile Delivery of COVID-19 Vaccines: The Cluster Strategy”. Nepal Journal of Epidemiology 11, no. 3 (September 30, 2021): 1079–1082. Accessed April 27, 2025. https://nepjol.info./index.php/NJE/article/view/39544.