Reference:Hays et al. 1976

From Global Warming Art

Hays, J. D., John Imbrie, and N. J. Shackleton (1976). "Variations in the Earth's Orbit: Pacemaker of the Ice Ages". Science 194 (4270): 1121 - 1132. DOI:10.1126/science.194.4270.1121. 

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