Sardar JC, Saren AB, Haldar D, Chatterjee K, Biswas S, Chatterjee T, Sarkar GN. Obstinate diphtheria needs innovation in immunization. Int J Contemp Pediatr [Internet]. 2016 Dec. 21 [cited 2025 Nov. 7];3(3):902-9. Available from: https://www.ijpediatrics.com/index.php/ijcp/article/view/44