1. Berson, D. M., Dunn, F. A. and Takao, M., Phototransduction by retinal ganglion cells that set the circadian clock, Science, Vol.295, No.5557 (2002), pp.1070-1073.
2. Billman, G. E., The LF/HF ratio does not accurately measure cardiac sympatho-vagal balance, Frontiers in Physiology, Vol.4, No.26 (2013), pp.1–5.
3. Brainard, G. C., Hanifin, J. P., Greeson, J. M., Byrne, B., Glickman, G., Gerner, E. and Rollag, M. D., Action spectrum for melatonin regulation in humans: Evidence for a novel circadian photoreceptor, Journal of Neuroscience, Vol.21, No.16 (2001), pp.6405–6412.
4. Chiang, H. C., Lee, D. G., Ko, B. W., Koga, K., Hirate, K., Munakata, J. and Yoshizawa, N., A study on the psychological and physiological effects by LED lighting for workspace, Transactions of AIJ. Journal of environmental engineering, Vol.75, No.654 (2010), pp.683–690 (in Japanese).
5. Dawson, D. and McCulloch, K., Managing fatigue: It’s about sleep, Sleep Medicine Reviews, Vol.9, No.5 (2005), pp.365–380.