Bhalla, L., V. Sehgal, P. Bansal, and S. Arora. “A Case of Dengue Encephalitis With Double Doughnut Sign”. Asian Journal of Medical Radiological Research, Vol. 9, no. 2, Dec. 2021, pp. 48-50, https://aijournals.com/index.php/ajmrr/article/view/2177.