1. Hansen K, Schliack K: Segmentale Innervation. Ihre Bedeutung für Klinik und Praxis. Stuttgart: Thieme; 1962.
2. Travell J, Rinzler SH: The myofascial genesis of pain. Postgrad Med 1952, 11:425–434.
3. Travell JG, Simons DG: Myofascial Pain and Dysfunction: The Trigger Point Manual. Baltimore: Williams and Wilkins; 1983.
4. Simons D: Muscular pain syndromes. In Myofascial Pain and Fibromyalgia. Edited by Fricton JR, Awad EA. New York: Raven Press; 1990:1–41.
5. Kellgren JH: On the distribution of pain arising from deep somatic structures with charts of segmental pain areas. Clin Sci 1939, 4:35–46.