Classification and diagnostic criteria for headache disorders, cranial neuralgias and facial pain.Cephalalgia1988, 8 (suppl. 7): 35–38.
2.
BechP.The diagnostic melancholia scale (DMS): dimensions of endogenous and reactive depression with relationship to the Newcastle Scales.Journal of Affective Disorders1988, 14: 161–70.
3.
BechP.Use of headache scales: a multiaxial approach.Cephalalgia1986, 6: 69–80.