Randomised Double-Blind Trial of Intravenous Fentanyl in Neuropathic PainLancet 349:753-758, Dellemijn,P.L.I.&Vanneste,J.A.L., 1997
Diagnosis and Management of MigraineBMJ 312:1279-1283, Goadsby,P.J.&Olesen,J., 1996