Londeix et al., 1996
From dinoflaj2
Londeix, L., Pourtoy, D. and Fenton, J.P.G., 1996: The presence of Dinogymnium (Dinophyceae) in Lower Cretaceous sediments from the northwest Tethys (southeast France and western Switzerland) and Gulf of Mexico areas: stratigraphic and systematic consequences. Review of Palaeobotany and Palynology, v.92, p.367-382, pl.1.
