Cluster Headache
BMJ 344:e2407, Nesbitt,A.D.,et al, 2012
The Acquired Metabolic Disorders of the Nervous System, Hypercapnia Pulmonary Disease
Adams & Victors Principles of Neurology Chp 40, pg 1139, Ropper, A.H.,et al, 2014
Acute and Preventive Pharmacologic Treatment of Cluster Headache
Neurol 75:463-473, Francis,G.J., et al, 2010
The Emergency Management of Headaches
The Neurologist 9:93-98, Green,M.W., 2003