1. Abe K, Suzuki T: Persistence of embryonic carotid-vertebrobasilar anastomoses. Folia Psychiat Neurol Jpn 18: 257–276, 1964
2. Adachi B, Hasebe K: Das Arteriensystem der Japaner, Vol. 1. Kyoto, Maruzen, 1928
3. Alpers BJ, Berry RG: Circle of Willis in cerebral vascular disorders. The anatomical structure. Arch Neurol 8: 398–402, 1963
4. Alpers BJ, Berry RG, Paddison RM: Anatomical studies of the circle of Willis in normal brain. Arch Neurol Psychiat 81: 409–418, 1959
5. Altmann F: Anomalies of the internal carotid artery and its branches; their embryological and comparative anatomical significance. Report of a new case of persistent stapedial artery in man. Laryngoscope 57: 313–339, 1947