Hellekson C J, Kline J A, Rosenthal N E
Am J Psychiatry. 1986 Aug;143(8):1035-7. doi: 10.1176/ajp.143.8.1035.
Six patients with seasonal affective disorder showed marked improvement in depressive symptoms after following three different 2-hour schedules of bright artificial light, and they relapsed when the light was withdrawn.