Reference
Felix Schlagintweit, Sigrid Missoni, Richard Lein, Hans-Jürgen Gawlick (2004): Rivularia barmsteinensis n.sp. and Rivularia ? loseri n.sp. - Two New Cyanophycean Algae from the Upper Jurassic-Lower Cretaceous of the Northern Calcareous Alps (Germany/Austria) – Jahrbuch der Geologischen Bundesanstalt – 144: 223 - 232.