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worldcat.org
Scheer, Frank A. J. L.; Wright, Kenneth P.; Kronauer, Richard E.; Czeisler, Charles A. (2007-08-08). Nicolelis, Miguel (ed.). "Plasticity of the Intrinsic Period of the Human Circadian Timing System". PLoS ONE. 2 (8): e721. doi:10.1371/journal.pone.0000721. ISSN1932-6203.
