Ahmed, Reza Nasim, et al. “Evaluation of Extra-Cranial Carotid Arteries by Digital Subtraction Angiogram (DSA) in Stroke Patients in a Tertiary Care Hospital”. Medicine Today, vol. 34, no. 2, Oct. 2022, pp. 121-4, doi:10.3329/medtoday.v34i2.61426.