Avoiding Pitfalls in the Diagnosis of Subarachnoid HemorrhageNEJM 342:29-36, Edlow,J.A.&Caplan,L.R., 2000
Headache Characteristics in Subarachnoid Haemorrhage and Benign Thunderclap headacheJNNP 65:791-793, Linn,F.H.H.,et al, 1998