Headache Caused by a Single Lesion of Multiple Sclerosis in the Periaqueductal Gray Area
Headache 33:452-455, Haas,D.C.,et al, 1993
Acute Disseminated Encephalomyelitis, MRI Findings & the Distinction from Multiple Sclerosis
Brain 113:291-302, Kesselring,J.,et al, 1990