Fensome et al., 1990
From dinoflaj3
Fensome, R.A., Williams, G.L., Barss, M.S., Freeman, J.M. and Hill, J.M., 1990: Acritarchs and fossil prasinophytes: an index to genera, species and infraspecific taxa. American Association of Stratigraphic Palynologists, Contributions Series, no.25, 771 p.