Sarkar, M., U. Dasgupta, S. Bhattacharya, K. D. Bhattacharyya, and S. K. Bhattacharya. “Status of Oral Polio Vaccination Program for International Travellers and Its Determinants: An Experience from a Designated Centre of West Bengal”. International Journal Of Community Medicine And Public Health, vol. 4, no. 4, Mar. 2017, pp. 1223-9, doi:10.18203/2394-6040.ijcmph20171353.