Khan, S., G. K. Gupta, D. Agrawal, S. H. N. Zaidi, J. Batra, S. Syed, L. Sharma, M. Khambira, D. A. Haile, G. Sethy, and S. K. Singh. “The Big Catch-Up: Addressing Zero-Dose Children As a Surrogate of Vaccination Disruptions During Public Health Emergencies”. European Scientific Journal, ESJ, Vol. 33, Sept. 2024, p. 286, https://eujournal.org/index.php/esj/article/view/18564.