Williams et al., 2015
From dinoflaj3
Williams, G.L., Damassa, S.P., Fensome, R.A. and Guerstein, G.R., 2015: Wetzeliella and its allies -- the 'hole' story; a taxonomic revision of the Paleogene subfamily Wetzelielloideae. Palynology, v.39, p.289-344, pl.1-5. (Published online 2015, hard copy 2016)