Lentin and Vozzhennikova, 1989
From dinoflaj3
Lentin, J.K. and Vozzhennikova, T.F., 1989: The fossil dinoflagellate cysts Kisselovia emend. and Charlesdowniea gen. nov. Review of Palaeobotany and Palynology, v.58, p.215-229, pl.1-3.