A. S. . Singh, J. P. . Singhvi, H. S. . Mann, and A. S. . Sidhu, Trans., “Thunderclap headache and boomerang sign in dengue encephalopathy”, Indian J Case Reports, vol. 7, no. 10, pp. 467–468, Oct. 2021, doi: 10.32677/ijcr.v7i10.3096.