Headache in Cerebrovascular DiseaseIn Handbk Clx Neurol, Ed, Vinken & Bruyn, Elsevier Publ Co, Ch 11, V 5, p. 124, Fisher,C.M., 1975
Headaches in Patients with Brain Tumors:A Study of 111 PatientsNeurol 43:1678-1683, Forsyth,P.A.&Posner,J.B., 1993