Comparison of cine MR imaging with Doppler echocardiography for the evaluation of aortic regurgitation. - Pflugfelder,P.W.; Landzberg,J.S.; Cassidy,M.M.; Cheitlin,M.D.; Schiller,N.B.; Auffermann,W.; Higgins,C.B. (Amer J Roentgenol, 1989)