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Okada, H., and Bukry, D., 1980. Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry, 1973; 1975). Mar. Micropaleontol., 5:321-325.

Olafsson, G., 1991. Quantitative calcareous nannofossil biostratigraphy and biochronology of early through late Miocene sediments from DSDP Hole 608. Medd. Stockholm Univ. Inst. Geol. Geochem., 203.

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Young, J.R., 1990. Size variation of Neogene Reticulofenestra coccoliths from Indian Ocean DSDP cores. J. Micropaleontol., 9:71-85.

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