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Heterosphaeridium difficile

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Year	Author	Title
1961	Alberti, G.	Zur Kenntnis mesozoischer und alttertiärer Dinoflagellaten und Hystrichosphaerideen von Nord- und Mitteldeutschland sowie einigen anderen europaeische Gebieten
1992	Costa, L.I. and Davey, R.J.	Dinoflagellate cysts of the Cretaceous System
1963b	Eisenack, A.	Cordosphaeridium n.g. ex Hystrichosphaeridium, Hystrichosphaeridea
2008	Fensome, R. A., Crux, J. A., Gard, G., MacRae, R. A., Williams, G. L., Thomas, F. C., Fiorini, F., Wach, G.	The last 100 million years on the Scotian Margin, offshore eastern Canada: an event-stratigraphic scheme emphasizing biostratigraphic data
1986	Ioannides, N.S.	Dinoflagellate cysts from Upper Cretaceous-Lower Tertiary sections, Bylot and Devon Islands, Arctic archipelago
1953	Klumpp, B.	Beitrag zur Kenntnis der Mikrofossilen des mittleren und oberen Eozän
1964	Manum, S. and Cookson, I.C.	Cretaceous microplankton in a sample from Graham Island, Arctic Canada
2008	Prince, I. M., Jarvis, I., Pearce, M. A., & Tocher, B. A.	Dinoflagellate cyst biostratigraphy of the Coniacian–Santonian (Upper Cretaceous): new data from the English Chalk.
2014c	Radmacher, W., Tyszka, J., Mangerud, G., Pearce, M. A.	Dinoflagellate cyst biostratigraphy of the Upper Albian to Lower Maastrichtian in the southwestern Barents Sea
1993	Williams, G.L., Stover, L.E. and Kidson, E.J.	Morphology and stratigraphic ranges of selected Mesozoic-Cenozoic dinoflagellate taxa in the northern hemisphere