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Sleep, performance, circadian rhythms, and light-dark cycles during two space shuttle flights.
Dijk DJ, Neri DF, Wyatt JK, Ronda JM, Riel E, Ritz-De Cecco A, Hughes RJ, Elliott AR, Prisk GK, West JB, Czeisler CA. Dijk DJ, et al. Among authors: ritz de cecco a. Am J Physiol Regul Integr Comp Physiol. 2001 Nov;281(5):R1647-64. doi: 10.1152/ajpregu.2001.281.5.R1647. Am J Physiol Regul Integr Comp Physiol. 2001. PMID: 11641138 Free article.