Schrank, 1987
From dinoflaj2
Schrank, E., 1987: Palaeozoic and Mesozoic palynomorphs from northeast Africa (Egypt and Sudan) with special reference to Late Cretaceous pollen and dinoflagellates. Berliner Geowissenschaftliche Abhandlungen (A), v.75, p.249-310, pl.1-12.
