1. Persistence of embryonic carotid-vertebrobisilar anastomoses;Abe, K.; Suzuki, T.;Folio psychiat. neurol. jap,1964
2. Transformation of the aortic arch system during the development of the human embryo;Congdon, E.D.;Contr. Embryol. Carneg. Instn,1922
3. Anomalous carotid-vertebral anastomosis, primitive cervical segmental artery;Conforti, P.; Armenise, B.; Galligioni, F.;Neurochirurgia (Stuttg.),1966