1. Symptomatic duplication of the vertebral artery;Hasegawa;Surg Neurol,1983
2. The normal and anomalous aortic arch and brachiocephalic arteries;Haughton,1974
3. Duplication of the internal carotid artery;Killien;Neuroradiology,1980
4. Congenital anomalies of the carotid arteries;Lie,1968
5. Vascular entrapment of the hypoglossal nerve in the neck;Olivier;J Neurosurg,1977