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Nagtegaal, J. E., Kerkhof, G. A., Smits, M., van der Meer, Y. G., & Swart, A. C. W. (1996). Onset of melatonine production before and after treatment with melatonin in patients with delayed sleep phase syndrome. In D. G. M. Beersma (Ed.), Sleep-Wake Research in The Netherlands (pp. 111-114). (7). Elinkwijk BV.
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Kerkhof, G. A., & van Dongen, H. P. A. (1996). Morning-type and evening-type individuals differ in the phase position of their endogenous circadian oscillator. Neuroscience Letters, 218, 153-156. https://doi.org/10.1016/S0304-3940(96)13140-2
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