1Sloan MA, Burch CM, Wozniak MA, et al. Transcranial Doppler detection of vertebrobasilar vasospas, following subarachnoid hemorrhage. Stroke, 1994,25: 2187-2197.
2Lindegaard KF, Nomes H, Bakke SJ, et al. Cerebral vasospasm diagnosis by means of angiography and blood velocity measurements. Acta Neurochir, 1989,100 : 12-14.
3Nederkoorn PJ, Mali WP, Eikelboom BC, et al. Preoperative diagnosis of carotid artery stenosis accuracy of noninvasive testing.Stroke, 2002,33: 2003-2008.