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APA Citation
Railsback, L. B., Gibbard, P. L., Head, M. J., Voarintsoa, N. R. G., & Toucanne, S. (2015). an optimized scheme of lettered marine isotope substages for the last 1.0 million years, and the climatostratigraphic nature of isotope stages and substages. Quaternary science reviews, 111, 94–106. http://access.bl.uk/ark:/81055/vdc_100042507703.0x000042