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2. Bradford , F. K. Spurling , R. G. The intervertebral disc with special reference to rupture of the annulus fibrosus with herniation of the nucleus pulposus
3. The extradural ventral chondromas (ecchondroses), their favorite sites, the spinal cord and root symptoms they produce, and their surgical treatment;Elsberg;Bull. Neurol. Inst. New York,1931
4. Spinal compression caused by ecchondrosis of the intervertebral fibrocartilage with a review of the recent literature;Hawk;Brain,1936
5. Cervical and thoracic intervertebral disk disease;Young;Med. J. Austral.,1946