1. The International Classification of Headache Disorders 2nd Ed. Cephalalgia 2004; 24 (Supl 1): 1-160.
2. Aspectos históricos y sinonimia de la cefalea en racimos;Balcells;Rev Neurol,1995
3. Classification and Diagnostic Criteria of the Headache Disorders. Cranial Neuralgias and Facial Pain;Headache Classification Committee of the International Headache Society;Cephalalgia,1988
4. Lugaresi E. cluster headache in the Republic of San Marino;D’Alessandro;Cephalalgia,1986
5. Incidence of cluster headaches: a population-based study in Olmsted County, Minnesota;Swanson;Neurology,1994