Cluster Headache
BMJ 344:e2407, Nesbitt,A.D.,et al, 2012
Cluster Headache:Pathogenesis,Diagnosis, and Management
Lancet 366:843-855, May,A., 2005
Diagnosing the Severe Headache
Neurol 44:S6-S12, Dalessio,D.J., 1994
Current Concepts in the Diagnosis & Treatment of Chronic Recurring Headache
Med Clin North Am 56:l257, 1972 Nov., Friedman,A., 1972