1. Abel, M.S.: Occult traumatic lesions of the cervical spine. CRC Crit. Rev. Clin. Radiol. Nucl. Med. 7, 469 (1975)
2. Jackson, R.: The Cervical Syndrome. pp 26–30. Springfield: Thomas 1966
3. Köhler, A., Zimmer, E.A.: Borderlands of the Normal and Early Pathologic in Skeletal Roentgenology. 3rd Edition. Wilk, S.P., ed., p 319. New York: Grune & Stratton 1968
4. Roaf, R.: Lateral flexion injuries of the cervical spine. J. Bone Joint Surg. 45B, 36 (1963)
5. Selecki, B.R., Williams, H.B.L.: Injuries to the Cervical Spine and Cord in Man. p 77. Australian Medical Association 1970