1. Eastcott, H.H.G. (1994) The Beginning of Stroke Prevention by Surgery. Cardiovascular Surgery, 2, 164-169.
2. William, P., Bannister, L., Berry, M., Dyson, M., Dussek, J.E. and Ferguson, M.W. (1995) Gray’s Anatomy. 38th Edition.
3. The role of the circle of willis in carotid occlusion: Assessment with phase contrast MR angiography and transcranial duplex
4. Hillen, B. (1986) The Variability of the Circle of Willis: Univariate and Bivariate Analysis. Acta morphologica Neerlando-Scandinavica, 24, 87-101.
5. Circle of Willis: morphologic variation on three-dimensional time-of-flight MR angiograms.