Sluijs et al., 2009
From dinoflaj3
Sluijs, A., Brinkhuis, H., Williams, G.L. and Fensome, R.A., 2009: Taxonomic revision of some Cretaceous-Cenozoic spiny organic-walled peridiniacean dinoflagellate cysts. Review of Palaeobotany and Palynology, v.154, p.34-53, pl.1-6.