Albayrak R, Degirmenci B, Acar M, Haktanir A, Colbay M, Yaman M. Doppler sonography evaluation of flow velocity and volume of the extracranial internal carotid and vertebral arteries in healthy adults. „J Clin Ultrasound”. 15 (1), s. 27-33, 2007. PMID: 17149761.
