William A. Berggren, Richard D. Norris, Biostratigraphy, Phylogeny and Systematics of Paleocene Trochospiral Planktic Foraminifera, Micropaleontology, Vol. 43, Supplement 1: Biostratigraphy, Phylogeny and Systematics of Paleocene Trochospiral Planktic Foraminifera (1997), pp. i-ii+1-116
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Berggren et al. (1997) studied this question.
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