1. Multiple hemorrhagic foci in bone;Barrie;Ann. Surg.,1920
2. Surgical Pathology;Boyd,1929
3. Unusual tumors of the spinal cord;Craig;S. Clin. North America,1930
4. Loose cartilage from intervertebral disk simulating tumor of the spinal cord;Dandy;Arch. Surg.,1929
5. Tumors of the Spinal Cord;Elsberg,1925