1. Röntgenologische Beobachtungen über die Bewegungen der Wirbelsaule;Bakke;Acta Radiologica Supplementum,1931
2. Plain radiography in intraspinal protrusion of lumbar intervertebral disks: a correlation with operative findings;Begg;British Journal of Surgery,1949
3. Nucleography;Erlacher;Journal of Bone and Joint Surgery,1952
4. A roentgen analysis of the motion of the lower lumbar vertebrae in normal individuals and in patients with low back pain;Gianturco;American Journal of Roentgenology and Radium Therapy,1944
5. Testing intervertebral joint movement;Ho;Journal of the American Osteopathic Association,1962