Riding et al., 2001
From dinoflaj3
Riding, J.B., Poulsen, N.E. and Bailey, D.A., 2001: A taxonomic study of the dinoflagellate cyst Muderongia simplex Alberti 1961 and related species. Palynology, v.24, p.21-35, pl.1. (Cover date 2000, issue date 2001.)