M J Krabbe-Hartkamp, J van der Grond, F E de Leeuw, J C de Groot, A Algra, B Hillen, M M Breteler, W P Mali,
Circle of Willis: morphologic variation on three-dimensional time-of-flight MR angiograms. Radiology. ,vol. 207, pp. 103- 111 ,(1998) ,
10.1148/RADIOLOGY.207.1.9530305