Willumsen et al., 2014
From dinoflaj3
Willumsen, P.S., Dale, B., Jolley, D.W. and Laursen, G.V., 2014: Palynostratigraphy and palaeoenvironmental shifts in Oligocene and Miocene strata from offshore Angola, west-central Africa. Palynology, v.38, p.259-279, pl.1-3.