1. An autopsy report of syndrome of compression of spinal cord owing to ossification within spinal canal of the cervical spine;Tsukimoto;Arch Jap Chir,1960
2. Ossification of the posterior longitudinal ligament of cervical spine with or without myelopathy;Okamoto;J Jap Orthop Assoc,1967
3. Posterior paravertebral ossification causing cervical myelopathy;Onji,1967
4. Ossification of the posterior longitudinal ligament of the cervical spine, analysis of 37 cases;Yanagi;Clin Neurol (Japanese),1967
5. Calcification of the posterior longitudinal ligament of the spine among the Japanese;Hiramatsu;Radiology,1971