Prasanna, L. C., L. S. Andrade, P. Ravichandra, and M. Hosapatna. “An Insight into the Circle of Willis, Its Variation in the Formation and Component Vessels in the Adult Human Cadavers”. Ethiopian Medical Journal, vol. 58, no. 02, Mar. 2020, https://mail.emjema.org/index.php/EMJ/article/view/1205.