“Comparison of Computerized Tomographic Angiography (CTA) and Digital Subtraction Angiography (DSA) in Patients With Subarachnoid Hemorrhage: A Retrospective Analysisy ”. 2021. Annals of Medical Research 27 (12): 3212-16. http://annalsmedres.org/index.php/aomr/article/view/3600.