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Mrosovsky, N., Boshes, M., Hallonquist, J.D. et al. Circannual cycle of circadian cycles in a golden-mantled ground squirrel. Naturwissenschaften 63, 298–299 (1976). https://doi.org/10.1007/BF00624025
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DOI: https://doi.org/10.1007/BF00624025