Headache Caused by a Single Lesion of Multiple Sclerosis in the Periaqueductal Gray Area
Headache 33:452-455, Haas,D.C.,et al, 1993
Dorsal Midbrain Syndrome in Multiple Sclerosis with Magnetic Resonance Imaging Correlation
Can J Neurol Sci 13:62-65, Costantino,A.,et al, 1986