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Micic, Gorica; de Bruyn, Amanda; Lovato, Nicole; Wright, Helen; Gradisar, Michael; Ferguson, Sally; Burgess, Helen J.; Lack, Leon . (2013). The endogenous circadian temperature period length (tau) in delayed sleep phase disorder compared to good sleepers. Journal of Sleep Research, 22(6), 617–624. doi:10.1111/jsr.12072 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research