1. Biological markers in major depressive disorder — A clinical and multivariate study;Ågren;Acta Univ. Ups., Abstracts of Uppsala Dissertations from the Faculty of Medicine,1981
2. Depressive phenomenology and levels of cerebrospinal fluid endorphins;Ågren;Ann. N.Y. Acad. Sci.,1982
3. Life at risk — Markers of suicidality in depression;Ågren;Psychiat. Devel.,1983
4. Depression and altered neurotransmission — States, traits, and interactions;Ågren,1983
5. Depression and CSF endorphins Fraction I — Circannual variation and higher levels in unipolar than in bipolar patients;Ågren;Psychiat. Res.,1984