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Campbell, Ian G., Christopher S. Burright, Amanda M. Kraus, Kevin J. Grimm, و Irwin Feinberg. "Daytime Sleepiness Increases With Age in Early Adolescence: A Sleep Restriction Dose–Response Study." Sleep 2017.

Campbell, Ian G., et al. "Daytime Sleepiness Increases With Age in Early Adolescence: A Sleep Restriction Dose–Response Study." Sleep 2017.