1. Tyuyama N (1984) Ossification of the posterior longitudinal ligament of the spine. Clin Orthop Relat Res 184: 71–84
2. Kurokawa T (1983) Ossification of the posterior longitudinal ligament (in Japanese). Clin Orthop 2: 116–141
3. Hattori S (1981) Clinical manifestation of OPLL (in Japanese). 81st lecture of the Japanese doctors association, Tokyo, 1981
4. Kirita Y (1984) Ossification of the posterior londitudinal ligament (in Japanese). New Clin Orthop 4A: 313–372
5. Terayama K (1976) Ossification of the posterior longitudinal ligament (in Japanese). J Jpn Orthop Assoc 50: 415–442