1. Simons DG, Travell JG, Simons LS: Myofascial Pain and Dysfunction: The Trigger Point Manual, vol 1, edn 2. Baltimore: Lippincott Williams & Wilkins; 1999. This is the major text in the field of myofascial pain. It details the principles of diagnosis and treatment, as well as outlines what is currently known about the nature of TrPs.
2. Carlsson CA, Nachemson A: Neurophysiology of Back Pain: Current Knowledge in Neck and Back Pain: The Scientific Evidence of Causes, Diagnosis, and Treatment. Edited by Nachemson A, Jonsson E. Philadelphia: Lippincott Williams & Wilkins; 2000:149–163.
3. Merskey H, Bogduk N: Classification of Chronic Pain, edn 2. Seattle: IASP Press; 1994.
4. Simons DG: Do endplate noise and spikes arise from normal motor endplates? Am J Phys Med Rehabil 2001, 80:134–140.
5. Hubbard DR, Berkoff GM: Myofascial trigger points show spontaneous needle EMG activity. Spine 1993, 18:1803–1807.