Harker and Sarjeant, 1975
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Harker, S.D. and Sarjeant, W.A.S., 1975: The stratigraphic distribution of organic-walled dinoflagellate cysts in the Cretaceous and Tertiary. Review of Palaeobotany and Palynology, v.20, no.4, p.217-315, pl.1.