Cluster Headache
BMJ 344:e2407, Nesbitt,A.D.,et al, 2012
Treatment of Sporadic Hemiplegic Migraine with Calcium-Channel Blocker Verapamil
Neurol 60:120-121, Yu,W. &Horowitz,S.H., 2003
Cluster Headache
Neurol 42 (Suppl 2) :22-31992., Mathew,N.T., 1992