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New insights on the morphology and occurrence of the Palaeogene dinoflagellate cyst species Duosphaeridium rugosum and on the
taxonomic affinity of the genus Duosphaeridium; Soliman, A; Fensome, R A. Journal of Systematic Palaeontology 2019 p. 1-13,
https://doi.org/10.1080/14772019.2018.1533896 (NRCan Cont.# 20180148)