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Chung, Y., and Craig, H., 1980. 226-Ra in the Pacific Ocean. Earth Planet. Sci. Lett. 49: 267-292.

Broecker, W. S., Goddard, J., and Sarmiento, J. L., 1976. The distribution of 226Ra in the Atlantic Ocean. Earth Planet. Sci. Lett. 32: 220-235.