Prasad, V.N., Chhetri, P.K. and Paudel, A. 2017. Normal Variants of the Circle of Willis in patients undergoing CT Angiography. Journal of College of Medical Sciences-Nepal. 13, 1 (Mar. 2017), 190–192. DOI:https://doi.org/10.3126/jcmsn.v13i1.16659.