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Kenny, A., Wisbey, C. R., & Shapiro, L. M. (1994). profiles of coronary blood flow velocity in patients with aortic stenosis and the effect of valve replacement: a transthoracic echocardiographic study.. Heart, 71(1), 57–62. http://access.bl.uk/ark:/81055/vdc_100142950334.0x000042