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The New England Journal of Medicine|January 5, 1995
Suppression of melatonin secretion in some blind patients by exposure to bright lightC A Czeisler, T L Shanahan, E B Klerman, et al.Journal of Biological Rhythms|August 19, 1999
Nonentrained circadian rhythms of melatonin in submariners scheduled to an 18-hour dayT L Kelly, D F Neri, J T Grill, et al.Science (New York, N.Y.)|June 26, 1999
Stability, precision, and near-24-hour period of the human circadian pacemakerC A Czeisler, J F Duffy, T L Shanahan, et al.Pageof 2