Karpenko, A. V. “Risk Factors and Features of Recurrent Bacterial Complications of Upper Respiratory Tract Viral Infections in Children”. Medicni perspektivi 22, no. 3 (October 12, 2017): 88–93. Accessed May 7, 2024. https://journals.uran.ua/index.php/2307-0404/article/view/111931.