1. Akiskal HS, Bolis CL, Cazzullo C, Costa e Silva JA, Gentil V, Lecrubier Y et al. Dysthymia in neurological disorders Mol Psychiatry 1996; 1: 478–491
2. Howland RH, Thase ME . Biological studies of dysthymia Biol Psychiatry 1991; 30: 283–304
3. Klein DN, Kocsis JH, McCullough JP, Holzer CE, Hirschfeld RM, Keller MB . Symptomatology in dysthymic and major depressive disorder Psychiat Clin North Am 1996; 19: 41–53
4. Ravindran AV, Merali Z, Anisman H . Dysthymia: a biological perspective. In: Licinio J, Bolis CL, Gold P (eds) Dysthymia: From Clinical Neuroscience to Treatment World Health Organization: Geneva 1997; pp21–44
5. American Psychiatric Association . Diagnostic and Statistical Manual of Mental Disorders Editions 3 and 4; 1980 1994