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Patel, M; Gomez, S; Berg, S; et al. (2007). "Effects of 24 h and 36 h sleep deprivation on human postural control and adaptation". Exp. Brain Res. 185 (2): 165–173. doi:10.1007/s00221-007-1143-5. PMID17932662. S2CID21029578.
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Fetveit, A; Skjerve, A; Bjorvatn, B (2003). "Bright light treatment improves sleep in institutionalized elderly--an open trial". Int J Geriatr Psychiatry. 18 (6): 520–6. doi:10.1002/gps.852. PMID12789673. S2CID33038056.
Patel, M; Gomez, S; Berg, S; et al. (2007). "Effects of 24 h and 36 h sleep deprivation on human postural control and adaptation". Exp. Brain Res. 185 (2): 165–173. doi:10.1007/s00221-007-1143-5. PMID17932662. S2CID21029578.