1. Abe K, Suzuki T (1985) Age trends of early awakening and feeling worse in the morning than in the evening in apparently normal people. J Nerv Ment Dis 173: 495–498
2. APA Association A P (1987) Diagnostic and statistical manual of mental disorders, DSM-III-R 3rd edn, rev. APA Press, Washington
3. Bojanovsky J (1969) Differenzierung der psychogenen und endogenen Depressionen. G Fischer, Jena
4. Cameron O, Lee M, Kotun J, McPhee K (1986) Circadian symptom fluctuations in people with anxiety disorders. J Affect Disord 11: 213–218
5. Carpenter L, Kupfer D, Frank E (1986) Is diurnal variation a meaningful symptom in unipolar depression? J Affect Disord 11: 255–264