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2. Psychiatric illness in general practice, a detailed study using a new method of case identification;Goldberg;Br Med J,1970
3. Verhaak PFM. Interpretatie en behandeling van psychosociale klachten in de huisartspraktijk. [Interpretation and treatment of psychosocial complaints in general practice] Utrecht. Thesis, 1986.
4. Variations in the diagnosis of psychosocial disorders: a general practice observation study;Verhaak;Soc Sci Med,1986
5. Detection of psychological complaints by general practitioners;Verhaak;Med Care,1988