Sardar, J. C., Saren, A. B., Haldar, D., Chatterjee, K., Biswas, S., Chatterjee, T. and Sarkar, G. N. (2016) “Obstinate diphtheria needs innovation in immunization”, International Journal of Contemporary Pediatrics, 3(3), pp. 902–909. doi: 10.18203/2349-3291.ijcp20162363.