References
- Stenstrom, R. (1948) Widening of the root defect in lumbar myelogram by Abrodil. Acta radiol., 29, p. 303.
- Walk, L. (1953) Diagnostic lumbar disk puncture. Arch. Surg., 66, p. 232.
- Walk, L. (1956) Clinical significance of diskography. Acta radiol., 46, p. 36.