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Amir, S., & Stewart, J. (1999). The effectiveness of light on the circadian clock is linked to its emotional value. Neuroscience, 88(2), 339–345.
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Evans, J. A., Carter, S. N., Freeman, D. A., & Gorman, M. R. (2012). Dim nighttime illumination alters photoperiodic responses of hamsters through the intergeniculate leaflet and other photic pathways. Neuroscience, 202, 300–308.
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Middleton, B., Stone, B. M., & Arendt, J. (2002). Human circadian phase in 12:12 h, 200:<8 lux and 1000:<8 lux light-dark cycles, without scheduled sleep or activity. Neuroscience Letters, 329(1), 41–44.
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