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Spitschan, M., Aguirre, G. K., Brainard, D. H., & Sweeney, A. M. (2016). Variation of outdoor illumination as a function of solar elevation and light pollution. Sci Rep, 6, 26756.
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Walmsley, L., Hanna, L., Mouland, J., Martial, F., West, A., Smedley, A. R., et al. (2015). Colour As a Signal for Entraining the Mammalian Circadian Clock. PLoS Biol, 13(4), e1002127.
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