1. Bailey W (1939) Persistent vertebral process epiphyses. AJR 42:85?90
2. Farmer HL (1936) Accessory articular processes in the lumbar spine. A review of 40 cases. AJR 36:763?767
3. Hipps HE (1939) Fissure formation in articular facets of the lumbar spine. Operative findings in one case. J Bone Joint Surg 21:289?303
4. Mitchell CL (1933) Isolated fractures of the articular processes of the lumbar vertrbrae. J Bone Joint Surg 15:608?614
5. Raymond J, Dumas JM (1983) Anomalous ossicle of the articular process. Arthrography and facet block. AJR 141:1233?1234