1. Biological markers in major depressive disorders: A clinical and multivariate study;Ågren;Acta Universitatis Upsaliensis, Abstracts of Uppsala Dissertations From the Faculty of Medicine,1981
2. Depressive phenomenology and levels of CSF endorphins;Ågren,1982
3. Plasma immunoreactive β-endorphin levels in depression: Effects of electroconvulsive therapy;Alexopoulos;Archives of General Psychiatry,1983
4. Long-term studies on immunoreactive human melatonin;Arendt;Annals of Clinical Biochemistry,1979
5. Annual rhythms in man;Aschoff,1981