1. Yunus MB, Dailey JW, Aldag JC, Masi AT, Jobe PC (1992) Plasma tryptophan and other amino acids in primary fibromyalgia: a controlled study. J Rheumatol 19:90–94
2. Waylonis GW, Heck W (1992) Fibromyalgia syndrome. New associations. Am J Phys Med Rehabil 71:343–348
3. Kaplan KH, Goldenberg DL, Galvin-Nadeau M (1993) The impact of a meditation-based stress reduction program on fibromyalgia. Gen Hosp Psychiatry 15:284–289
4. Rizzi M, Radovanovic D, Santus P, Airoldi A, Frassanito F, Vanni S, Cristiano A, Masala IF, Sarzi-Puttini P (2017) Influence of autonomic nervous system dysfunction in the genesis of sleep disorders in fibromyalgia patients. Clin Exp Rheumatol 105:74–80
5. Tunks E, Crook J, Norman G, Kalaher S (1988) Tender points in fibromyalgia. Pain 34:11–19