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Nagtegaal, J. E., Kerkhof, G. A., Smits, M. G., Swart, A. C. W., & van der Meer, Y. G. (1997). Delayed sleep phase syndrome: a placebo-controlled cross-over study on the effects of melatonin administered 5 hours before dim light melatonin onset. In D. G. M. Beersma (Ed.), Sleep-Wake research in the Netherlands, Vol 8 (pp. 91-94). Elinkwijk.
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