References
- Lindgren, E. (1950) Percutaneous angiography of the vertebral artery. Acta radiol, 33, p. 389.
- Radner, S. (1947) Intracranial angiography via the vertebral artery. Acta radiol, 28, p. 838.
- Sugar, O. , Holden, L. B. and Powell, C. h. B. (1949) Vertebral angiography. Am. J. Roentgenol, 61, p. 166.