Advances in Cluster Headache
Neurologic Clinics, 8:867-8901990., Mathew,N.T., 1990
Pleural and Retroperitoneal Fibrosis from Dihydroergotamine
NEJM 321:1760, Malaquin,F.,et al, 1989
Arterial Complications of Migraine Treatment with Methysergide & Parenteral Ergotamine
BMJ 285:260-261, Joyce,D.A.,et al, 1982