References
- Cyriax J: Textbook of Orthopedic Medicine, Vol I: Diagnosis of Soft Tissue Lesions, ed 5. Baltimore. Williams and Wilkins, 1970, pp 23–33
- Zohn DA, Mennell JM: Musculoskeletal Pain: Principles of Physical Diagnosis and Physical Treatment. Boston. Little, Brown, and Co. 1976, pp 135–137