Kanchan, Ngangom, Vijay Kumar Tiwari, and Sherin Raj TP. “Post-Introduction Evaluation (PIE) of Covid-19 Vaccination in Delhi: Application of WHO Framework”. Journal of the Epidemiology Foundation of India 3, no. 1 (March 31, 2025): 63–78. Accessed February 7, 2026. https://efi.org.in/journal/index.php/JEFI/article/view/52.