Sangiorgi et al., 2009
From dinoflaj3
Sangiorgi, F., Brinkhuis, H. and Damassa, S.P., 2009: Arcticacysta: a new organic-walled dinoflagellate cyst genus from the early Miocene? of the central Arctic Ocean. Micropaleontology, v.55, no.2-3, p.249-258, pl.1-4.