Stover and Williams, 1995
From dinoflaj3
Stover, L.E. and Williams, G.L., 1995: A revision of the Paleogene dinoflagellate genera Areosphaeridium Eaton 1971 and Eatonicysta Stover and Evitt 1978. Micropaleontology, v.41, no.2, p.97-141, pl.1-7.