RT Journal Article SR Electronic T1 Early descriptions of cluster headache JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 466 OP 466 DO 10.1136/jnnp.52.4.466 VO 52 IS 4 A1 JMS Pearce YR 1989 UL http://jnnp.bmj.com/content/52/4/466.abstract AB