1. Epidemiology and comorbidity of headache;Jensen;Lancet Neurol,2008
2. Fumal A, Schoenen J. Chronic Tension-Type Headache. En: Chronic Daily Headache for clinicians. Goadsby, Silberstein, Dodick editores. 2005. BC Decker Inc. Hamilton. London. pp: 57-64.
3. Aguirre Sánchez JJ. Cefalea tensional. En: Tratado de Cefaleas. Mateos, Pareja, Pascual editores. Madrid, Luzan 5 SA, 2009. Pág: 249-264.
4. The International Classification of Headache disorders. 2nd edition. Cephalalgia 2004; 24 (Suppl, 1):9-160.
5. Tension-type headache: the most common, but also the most neglected headache disorder;Bendtsen;Curr Opin Neurol,2006