Pelupessy, J. M., Makmur, R., & Daud, D. (1991). Bull-Neck, Electrocardiographic Changes and Creatine Phosphokinase Blood Levels in Patients with Diphtheria. Paediatrica Indonesiana, 31(11-12), 303-11. Retrieved from https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/1452